There is a fair amount of trash through here, but nothing overwhelming. Main trash to the first boss just interrupt casts, no CC needed. The bigger elementals are the more threatening. Before the first boss there are 2 of these elementals. Keep constant interrupts up and you will win. Elapsed said you can use Turn Evil on them, but that and Banish I think are the only things you can use on them. They do pat into a room, so you can bypass them if you want to wait.
First boss, Sadana Bloodfury, isnt too bad. Just make sure you do NOT step on the purple runes on the ground. She will summon a dagger above a random player, move out of it. It will do aoe dmg to players nearby so just avoid it once its on the ground. She will summon a spirit add, stun it and kill it. If it reaches her it will heal her for 25% of max health and give a dmg boost. She will run to the middle of the room and summon an eclipse that deals massive dmg. To negate this dmg, stand on one of the highlighted moon runes on the ground (see vid) and it will reduce the dmg by 80%.
Trash to the 2nd boss can be a pain. There are adds that constantly channel a rend type ability on players, focus these adds and keep them interrupted/cc'd. If one player gets tag-teamed by 2 rends, they will likely die. Also stay away from the square graves on the ground, adds will spawn from these if you get too close. This comes into play in the next boss encounter.
Second Boss, Nhallish, is fairly simple, but if you arent quick during the phased part, you will die. Keep the boss faced away from the group, he will channel a frontal cone ability that will follow you if you try to strafe out of it, so tanks just need to sit there, pop a minor cd and deal with it. He will teleport to a random target, and channel a whirlwind/vacuum. Run out of this, once you get so far away you wont be pulled in any further. He will send you to a phased realm and separate your spirit from you. You need to kill your spirit and click on the remains to get out of the phase. If you do not kill it within 20 secs you will die. The spirit will constantly run away from you so use slows or stuns to help out. Healers be sure you have your offensive spells on your bars for this. He will also shoot lots of shadow missiles into the air that crash to the ground and leave void zones. These are easily avoidable and will despawn over time. Stay away from the outside of the room to avoid spawning adds from the square graves I mentioned before.
Trash to 3rd boss can be rough. Use CCs on the casters and kill them one by one to make life easier or you will get overwhelmed with adds. After those you will have bats and spiders to deal with. The bats are too big of a deal, but the spiders can kill the tank relatively quick with their poison. They have 2 attacks and one of which applies a debuff and REALLY hurts on the application. Cannot remember the name of that ability, but that is the priority to interrupt. On the long bridge to the boss there are bats and a giant worm that will spawn (similar to the lava worms leading to Rag in Firelands). Try to range pull the bats and kill them before spawning the worm. Tank stay in melee range of the worm and dont get hit by slam. If you get knocked in the water, use the blue water jets coming from the water to get back to the platform.
3rd boss Bonemaw, was kind of a pain the first time Elapsed and I ran it, but was easier with a guild group. Tank the boss facing to the side of the platform to keep his slam from hitting the group. He will use "Inhale" to suck you into his mouth to eat you. When the notifcation for this comes up, run to the other side of the platform and start running away to avoid being pulled in. The pull gets stronger near the end of the cast/channel. He will spawn death zones on the ground, itll just look like a circle with skeleton arms grabbing around at you, if you are having a hard time running away from the Inhale, you can stand in these and it will root you in place, BUT you will take a lot of dmg being in them. Its easier just to run away. After the first Inhale he will spawn back his 2 worms from trash you fought earlier. You need to have 2 other players in melee range of them or they will spam cast poison on to the group and kill you. Try to keep them facing away from the middle of the room so the slams from both of them and the boss do not cover the entire platform. If the slam positioning is bad and there is nowhere to stand, JUMP off the platform and swim to the water jet thing to get back to the platform quickly. Focus the smaller worms then back on the boss. Once the smaller worms are dead, the boss will randomly change his position from his main place to one of the other 2 worm spawn locations. Nothing changes in regards to the fight overall, abilities all remain the same, just the positioning is different.
Trash to last boss is just a 2 spider, 2 bat pack. Then a 2 elemental pack before the door.
Last boss is overtuned and we were not able to kill it. It would be best to watch the video to understand what goes on. Primarily just keep him faced away from the group. He will always cast his big dmg-ing ability towards the tank, which leaves a large corruption line on the ground for a few seconds, and will always drop his shadow orb (pulses AoE dmg) on the tank, so there is always a lot of repositioning for the tank. The skeleton add line needs to be dealt with as soon as it spawns, kill one skeleton to break a hole in the line for the group to move through. Touching the skeletons or the shadow corruption behind it is a one-shot. The big thing with this is the constant group dmg going out that really screws with a healer. That and the timing of the abilities, the tank has to be REALLY quick to time when he uses his shadow line and orb ability to be able to get through the hole so he doesnt drop either of those in the middle of the group and wipe them. You can see what I mean by the vid. At the end the timing was bad and the line got dropped right down the middle of the escape path. It was a wipe by that time anyways, but thats the frequent issue that kept arising during our attempts. A bit overtuned for a normal.

This dungeon has some trash to be concerned about, so Ill go over them a little before the bosses.

Trash leading up to the first boss isnt too crazy, but there are some goblin adds (I think they were engineers) that should be focused down.  They will run to iron stars in the room, once reaching them they will try to activate it.  Interrupt or stun them.  If an iron star goes active, it will roll into a wall a deal group wide dmg.  The bigger adds just charge a random player.

First boss encounter Rocketspark and Borka isnt anything too crazy.  Rocketspark just jumps around the room and fires missles at players.  One ability will target 2(normal) or all players(heroic) with reticles.  Move as soon as they appear, they hurt.  He will jump up on boxes for a channeled barrage attack.  This is where Borka come into play.  For the most part Borka is underwhelming.  Just keep him in the middle of the room.  Shortly after Rocketspark jumps up for his channeled ability have the tank face Borka towards him.  Borka will charge and stun Rocketspark, interrupting his channel.  Just rinse and repeat.  On heroic Borka does a slam that deals grp dmg and interrupts spellcasting for 5 secs.  Dont be casting when this goes off.

Trash to the second boss isnt too terrible, but should utilize CC's to make it easier.  Their are several types of orc adds.  Grenadiers, Boomers, and Gunners.  The ones you need to be concerned about the most are the Gunners.  You need to face them away from the group, they will spam cast a flame ability that deals a lot of dmg.  There is one pull in particular where there are 2 of them, the definitely need to be CC'd.  If they both are positioned wrong and cast into the group then GG, death.  Good thing to remember (which I had a hard time doing) was that once they start casting, you can strafe out of it.  So tanks just make sure to keep strafing left or right while they are spam casting it so you dont spin it into the group.  The grenadiers and boomers arent too severe.  They just throw grenades and bombs into the group.  There is another mob, named cinder-something, that will toss fire patches on the ground, just move out of those.

Second boss, and everyones favorite, Nitogg Thundertower, is the bastard of the place.  He is also the "turret boss".  You dps him for a while inside the room, then he will open up the train and retreat to his turret, constantly firing at you and focusing on a player.  When he focuses on a player, just have them LoS behind a pillar to avoid his barrage.  He will constantly spawn adds into the fight.  Infantry (just cleave down), Grenadiers, and Boomers.  On heroic he will also spawn the Gunners, do your best to face them from the group.  But thankfully on heroic they just dont sit there and spam cast at you, so you CAN reposition them a bit to help out.  During this fight you objective is to stay line of sight of the boss as much as possible.  Deal with adds then click on their bodies to obtain their "weapons".  Grenadiers drop grenades that you can use via your extra action button.  You should use these to help kill all of the adds quickly.  If there are no adds up, use them on the boss.  The Boomers give you shells which will allow you to use the turrets on the sides of the train (you can see Saedo using them in the vid), you will use the turrets to deal the most damage to the boss' turret.  You can also use one of the abilities on the turret to help kill adds if you dont have any grenades.  Once the boss' turret is destroyed he jumps out and you just kill him the rest of the way.  In the vid you will notice fire covering a significant part of the train and we have to retreat backwards, it deals a lot of dmg and leaves a nasty debuff.  That is only on heroic, there is no ground fire on normal.  Also, if you have a shaman, or another caster with a significttn knockback, you CAN knock the adds off the sides of the train to watch them go bye-bye, but by doing that you risk losing grenades or shells to use on the boss.  So utilize that wisely.

Trash up to the last boss isnt bad, just wait for fire to be gone on either side of the one car, then run as fast as you can past it so you dont die.  Then the last cars trash can be pulled in small packs.  Nothing really special about them.  Once you kill the last pack, go back to the entrance of that car so the boss doesnt land on you.

Last boss Skylord Tovra isnt too terrible.  Her wyvern will do fly bys and drop lightning patches in the ground that despawn after a while.  She will also throw a "spinning spear" at random players.  This is similar to the gunners that once she begins her cast of it, you can side-step and avoid the dmg.  She will also throw traps randomly at players, these can be dodged if you move quick enough, otherwise you get frozen in place and can take a bit of dmg.  On heroic she places a hunters mark on a random player and will throw an explosive spear at the target and deals dmg to anyone with 8 yards.  Also the lightning breath lasts longer and will eventually fill up the floor, sort of a soft enrage.  It will still despawn as it did for us, but you will unavoidably have a full platform for a while if the fight lingers too long.

The first boss, Vigilant Kaathar, wasnt too bad.  We screwed up on part of the mechanic because it had a graphical bug and we werent able to utilize a shield properly to negate group aoe.  Youll see us talking about that in the vid.  He will throw lightning out, ala Lei Shen style but it will stay their through the whole fight, just stay out of it.  He will drop orbs on players that will explode over time.  Main thing is just stay out of lightning, stay kind of together but spread.  Then when he throws the shield (hopefully the graphical error will be fixed) stand behind it to negate the AoE.  But dont get behind it too quick because he might drop the orbs on you if you stack too soon and youll blow up while behind the shield instead.

Second boss Soulbinder Nyami went by fairly quick.  She will just constanly cast, and will sprint to groups of bodies around the room, which will rez some spirits that you just need to cleave down.  One of which does a cool charge ability that spreads a few AoE lines on either side of him.  Only other thing of note is she will pop up a bubble that everyone needs to stand in and she will cast a spiraling AoE that hurts a fair amount.

Third Boss Azzakel was a bit rougher.  You dps him for a while, interrpt his cast.  He will fly up in the air (time based) and become immune while he summons 3 types of adds, a Felguard, and 2 types of imps.  One type will just stand and free cast which will deal a fair amount of dmg, the other will be on fire and running around like a chicken with its head cut off.  If those ones hit you, you will get disoriented and run around for 5 secs unable to do anything unless you "every man" out of it, etc.  Those adds should be your priority.  We tried to ignore the adds and just burn him, but it didnt work out and we killed the imps and cleaved down the felguards with the boss and that worked best for us.  It was the hardest fight in the instance IMO.

Last boss Teron'gor was an interesting fight.  You start out flying to 3 platforms, each platform has a warlock on it, each with a spec of the warlock tree (demo, afflic, dest).  After you kill them you will go down to the main platform.  He will randomly choose one of the warlock specs and youll have to deal with those abilities during the fight.  Once his health gets low he will retreat and the fight ends.