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Created for the duration of a battle with SpawnLavaBug. As with all other summons, it is created with stats derived from the summoner's Magic.
The LavaBug makes for a useful frontline unit on a lava team. They have LavaTrail for changing the terrain if you find yourself without Create Lava, they have Fireball for some extra damage and Burn stacking, and you can use Explosion without losing a party member.