Lava Guardians
From Dungeon Defenders 2 Wiki
Description
The Lava Guardians are a melee enemy type and they are a stronger version of the Orc When they die they drop a big Burning Lava Stone which is used in the Molten Citadel Incrusion to kill the boss, And in normal maps it gives you a Speed Boost.
Strategy
You will need some good damage to take them down, as such, using defenses that have high damage outputs are recommended.