Boss Ragnar is the ultimate combatant in terms of raw power. Not only does he possess immense health and decent attack, any act of dealing or receiving damage boosts his attack, and he can heal every turn with Regeneration.
Boss Ragnar drops infrequently from Sanguine Tribe (Hard), and appears to be the only way to obtain it (other than AH and Soul Summoner).
On Awakening, Boss Ragnar gains increased health and Carnivore, granting him another form of healing. This grants him the ability to gain both attack and health by crushing his foes.
*NOTE: Fields that contain the text *See above means the effect remains the same until said otherwise.