Um um um um, think brain think! Okay, so, this is very difficult because i have NEVER done any of the boss fights, so, um, okay, king titan. Very large, maybe 10x larger than the other titans. Deals a ton of damage, it can kill an army of gigas within seconds. One of the best things to fight it with is a mega mek. Idk what you need to summon it. Thats all i know, sorry if this wasnt any help at all.

-shadwo