Underwild Gems have a chance of spawning on the board when an enemy attacks or fires their Special Skill. They can also spawn if a Hero with the Underwild Family Bonus casts their Special Skill. These gems deal damage to a random hero (or enemy if spawned by your own team) each turn until they are matched.

Underwild Gems can only spawn on regular shields that match the element of the enemy or Hero which spawned the gem.