Xyrophales

Xyrophales is a son of the God of Knowledge. He's a smug mean spirited demigod with his own interdimensional library and a desire to mess with mortal's lives by revealing and hiding some very important bits of information.

If you seek forbidden knowledge, you may enter his library freely and go through all the books and papyruses he has stored, freely, but it is not certain if you will be able to leave it in the same shape you entered.

This shape is what I imagined his "darksouls boss" form. When you disrespect him or his library, he challenges you, transforms and summons a spear. You may choose a weapon from one of hundreds hanging in his library and fight for your survival.