Bosses usually control access to other areas throughout the game. Most bosses are mandatory for the completion of the main quest line, and some are optional.
Upon defeat, all bosses drop individual souls specific to themselves. These may be consumed or sold to acquire a large quantity of souls or may be transposed by Ludleth of Courland for weapons, shields, rings, miracles, pyromancies, or sorceries.
There are also minibosses in the game that do not respawn once killed. For the purposes of this wiki, those minibosses who drop a unique itemized soul are included in this article.