wall of skin in LtA

have prismatic damage active
have love bugs
dual wield anything and anything (offhand smirking shrunken head is best, followed by hot plate, followed by weapon)

enable autoattack vs bosses
set your autoattack to love stink bugs
have full hp
autoattacking love stink bug followed by kneebutt/headbutt x3, sauceshell, shell up, kneebutt deals 2*7+7+7+7+1+1+7 = 44 damage with 7 rounds where passive damage fires and 6 rounds where damage on hit fires
, so you'd need an additional 1 source of damage/round (e.g. spiky shell, jalapeno saucesphere, psalm of pointiness, anything.)

without sauceshell and shell up,
autoattacking with love stink bug followed by kneebutt/headbutt x4 deals 2*5+7*4 = 38 damage with 5 rounds where passive damage fires and 4 rounds where damage on hit fires, so you'd need an additional 3 sources of damage/round.