Personally, I think SE royally fucked up coding tiamat.
Vrtra is pretty much guaranteed Manteel (some people say that its possible that it wont drop enough ingreds, I've never seen this), but its the biggest hassle of them all to kill.
Jormungand is guaranteed 4 moly ores per kill, that's good for four Corazzas, yet only drg's bother with them, because war's have better shit to buy. How many endgame drg's are there ?? 0. Not to mention getting to Jormungand isnt really a walk in the park, with those annoying TS mobs.
And then theres Tiamat. With the best loot, relative ease to kill and easy to access, the loot isnt guaranteed. My past two Tiamat kills went like this:
Tiamat falls to the ground.
You find a Fire Crystal on Tiamat.
and
Tiamat falls to the ground.
You find a Fire Crystal on Tiamat.
You find a Fire Crystal on Tiamat.
that 2nd time was with TH3 in too.
So SE makes this wyrm that everyone wants to farm, yet its on a 3-8 day respawn, and theres nothing guaranteed in drops, whereas there are two other wyrms, with guaranteed drops, that are either: shitty drops, require a huge alliance to kill.
gg SE.