Morimar:
The T1 Matamata is tricky. Constant AoE knockbacks on his regular spinning attacks, so tanks wont enjoy that one.
The T2 Raptor isnt too bad. He hits a little fast and hard, but probably the most reasonable to try now in 20 mins :/
The T3 Eft (i think it was) i have no real experience with, but knowing Eft moves he shouldnt be too bad either. Stuns, poison, dispel, that's about i.
Foret:
The T1 Craklaw has damage immunities from TP moves, and you need to position yourself properly in order to deal either magical or physical damage, since the wrong place will cause next to zero's. I wouldnt recommend this guy for a 20 minute zerg.
The T2 Uragnite is equally as anoying. Once it goes in his shell, your damage will go down to single digits. Not the preferably monster for 20 minute zergs either. Also, AoE constant poison.
The T3 Jagil is your best target of this bunch. He casts some NASTY magic. Downright spams it, however, he does so in order, so you can prepare for the big spells in time for stuns. He has elemental added effect damage that gets downright insane, though maybe not so much now with a 20 minute limit. Other than that, he's not too tough really.
which leaves us with Ceizak...
The T1 Twitherym isnt too bad outside of some of his TP moves (blind, silence, paralyze). Fought him a few times inside the fractures too. Pretty doable if needed.
I wouldnt recommend the T2 Chapuli. Damage immunities after his TP moves, and he can hit hard on anyone that is not a tank. Not really anything special, but he does get crazy evasion if you WS on him a lot. Has regular moves, on top of one reasonable AoE damage one. Just with all the evasion, not a good target for a short-time duration zerg.
And that leaves us with the T3 Scorpion. Took us 30 minutes to take down inside the Delve Fractures. Throw a good Ochain PLD on it and you're set. However, his attacks can occasionally get past the shield and deal a lot of damage. Death Scissors hit a PLD in full -PDT gear for 1400. It's likely to imagine anyone else caught by it would die instantly. He does a nasty stomp and i recall being paralyzed at one point. Not really sure how that happened, conal aoe spray or something. Just place two tanks on each side and have DD's come /THF for Sneak Attacks and with a good fully buffed and NNI/Salvage2 geared group, 20-30 minutes probably isnt too uncommon.
And i guess that is about it. Good luck! I've mostly been bard, only tanked the Scorpion for a bit on PLD, so i dont really know how the rest of the guys do as far as damage dealing is concerned. Just asume everything hurts like hell and adjust accordingly.
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[XI] Surivere of Valefor
[XIV] Sir Surian Bedivere of Behemoth
http://na.finalfantasyxiv.com/lodestone/character/2401553/