Kraken

One would think, that a boss that can't attack would be easy, but not this one, the kraken is the hardest or most annoying of the bosses. The boss encounter comes with 8 tentacle enemies. The boss uses either dive if it needs to move or waterfall if there is a target within range, for the majority of combat it will just defend. The general strategy for this boss is a battle of attrition. The bosses tentacles are immortal, deal moderate damage and increase lust, its somewhat dangerous to be caught by all 8 of them. There isn't a consistent strategy team wise as your squishier units can be assaulted, if they get too close to the water. Since tentacles can't be killed they require tanks and lust relief, not to mention everything is happening in water. The most reliable strategy is for the MC to move to one of the map corners, this way it will require to tank only 2 tentacles and the krakens waterfalls. If by chance you have any other units you can move them deep into land, the tentacles will dive around, but they can't reach you if you're not close enough, since they can only move via dive skill. The final issue is the krakens massive health pool and its constant defending. Its recommended for the mc to have around 50 str or magic for the battle to not take forever. The breaker sword is also highly recommended. While other party members can use map wide skills to help, they either needs triple digit magic or massive pools of mana. Frankly, worlds end is the only viable skill against this bosses larger than the mushroom health pool and only on turn 1. Upon defeat the kraken drops some tentacle weapons. Also it should be noted, that any boss fusion or offspring loose the giant trait, so if you wish to obtain a boss in all its glory you need to capture them.