i like the idea of the knight-lava monster swap au.
i also like the idea the humanoid lava monsters used to be humans (maybe even knights)
anyways for the sake of this whole concept -
lavaria - javaria linn (javelin / black raven)
general magmar - magnus murgleis (murgleys sword / gold wolf)
whiparella - her name stays the same (snake whip / wine red snake)
beast master - beck de faucon (poleaxe / brown bear)