Our main tank (templar) wasn't here so we decided to try a 5 man run for fun. I'm normally not the main tank and thus did some mistakes which I highlighted so you don't have to repeat them.
My gear: GBG Pole +10 with SW fuse / Tac Dagger +10 / Tahabata Sword +10 / Full 50e / PvP Accs

Check what buffs you're using and only use the most important ones. It's very easy to overbuff stuff.
Use the default graphic option! The other one will cause client crashes.

Correction for what I wrote starting 10:40: We tested a different tactic in the run we did after and you can mostly avoid the stated issue if the tank doesn't run into the middle / onto the boss but instead runs to the side as he's doing in the other phases. That way, even if the bite is weird, you know that his front faces towards the outside of the arena.
Adding to this here since it already about "the bug" that makes the fight very dangerous, especially in the last phase.
I've taken an example of our run and described in this picture here: [ Ссылка ]
After he casts bite do not look at his model but where the tank was when he got bit. That spot will be where Tiamats front faces to. Remember it and position accordingly. If Tiamat does the nuke or an autoattack he'll reset the position again and the model will accurately show where the skills go.

The puddles seem to be programmed to spawn randomly withing a certain area of where you stood and contrary to what I wrote the server is not at fault for once.

The game runs on NCSoft logic not common sense. None of Tiamats skills deals fire damage. The Front AOE deals dark-damage and the stun, puddles and the nuke earth-damage. Also the frontal AOE can be resisted with skills / high enough MR.

Front AOE: [ Ссылка ]
Stun / Puddles: [ Ссылка ]
Nuke: [ Ссылка ]

See also different PoVs / first kill EU:
Chanter: [ Ссылка ]
Cleric: [ Ссылка ]

Songs:
Paul M - Bacata
Nhato feat Hiroyuki ODA - Moonquake (Guiam Edit)
Nhato & Kenji Sekiguchi - Refrain
Dash Berlin feat. Roxanne Emery - Shelter (Photographer Radio Edit)

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