Final Fantasy XIV 2.4 Sastasha Hard Mode Guide
BOSS1: Karlabos will drop Aqua Balls on players to apply a DoT called Slime
Tails crew: To use his tail to make the whirlwind and target player random. It which will take out a huge chunk of your HP, the exact damage is supposedly 99% HP. If you are targeted by Tail Screw, move close to the healer just enough for him to be able to heal you. To move fast from your spot as Tail Screw hits, you can avoid death via whirlwind.
BOSS2: Captain Madison is a irritable boss and always summon adds.
One of the third wave adds will mark a random player and limit movement, we should kill it first. Meanwhile, he will keep shooting and add damage, we need enough DPS to clear all adds as soon as possible.
BOSS3: The Kraken, when only Kraken and Tentacles are up, attack Kraken and ignore Tentacles
Around 50% and 25% HP, a lot of Tentacles will show up and use Wallop/Clearout repeatedly. Heal through this phase and focus on boss, because the Tentacles will disappear after this phase.