That'sssss a very nice Gem you've got there...

Arcane: Rage
Base Rarity: Common
Troop Type: Daemon, Monster
Troop Role: Striker
Troop Id: K21_06 / 6217
Max skills: 14    17    21    7
Kingdom: Blighted Lands
Kingdom Id: 3021
Trait #1: Monster Bond
Allied Monsters gain 2 Life.
Trait #2: Immune
Immunity to Disease.
Trait #3: Plague Touch
Inflict Disease when doing Skull damage.
Spell: Shred
Description: Deal [Magic + 3] damage to an enemy and Disease them.
Mana Color: Red
Mana Cost: 7
Spell Id: 7359