Yeti Titans are significantly larger and stronger versions of regular Yetis that are only found in the original Fate game. Because they are so powerful, Yeti Titans are usually found alone or accompanied by very weak creatures.
The stats of a Yeti Titan is very similar to that of a normal Yeti, but their strength and defense skills are even higher. Still, though, Yeti Titans have no specific resistances or weaknesses, so you don't have to worry about whether or not you're using the right or wrong weapon against it. But keep in mind that Yeti Titans also have a few spells to slow you down with. They will try to use Ice Balls to slow your movements and Draining Aura to steal your mana. Luckily, they have low mana skills so a Yeti Titan can only use two or three spells before he's completely depleted his mana.