User blog comment:Hitsuji Mamoru/FGO-style Servant Creation Room/@comment-4802891-20170126185018/@comment-4802891-20170127135053

@Shiki : I didn't make it very clear, I admit. Let me explain^^

Since his body is hollow in Boar form, he can hide people in there. His Boar form is also heavily associated to the day he went berserk and saved his children by hiding them in said body. The Stun is equivalent to "hiding his allies" : they won't take damage because of the self-Taunt, but they won't move either because they are in his body.

Of course, it's simply implied, the characters won't just disappear from the battlefield during the active turn^^

Also, Medusa of Gold is a fake name. He is really just Chrysaor who used his Shapeshift ability to try and match his mother's stats and appearance. The more he ascend, the less he looks like Medusa : 1st stage is just Medusa Lily without the headband and a gold armor, 2nd stage is Medusa Lily with half of her hair dyed gold, less armor and small gold wings and 3rd stage is Medusa Lily with gold hair, small horns, even less armor (and a codpiece lol) and big gold wings.