I picked up a ring last night that turns damage I take with fire into Mana. I have solid life on hits with my pets, so basically I get unlimited mana when I'm standing on lava. My buddy has an amulet that changes that makes you immune to fire and turns 11% of the damage into healing.
Not sure if it actually works in combination, but if it did, then standing on lava would generate health and mana for you. That'd be pretty awesome!
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