Tartarus
I say TarTARus. You say TarTERus.

Arcane: Plains
Base Rarity: Legendary
Troop Type: Daemon
Troop Role: Warrior
Troop Id: Boss_K55 / 6874
Max skills: 20    27    14    13
Kingdom: Depths of Sin
Kingdom Id: 3072
Trait #1: Deep Magic
Gain 5 Magic when attacking Delves.
Trait #2: Daemon Shield
Allied Daemons gain 2 Armor.
Trait #3: Darken Souls
Gain 3 Souls when matching Skulls.
Spell: Hellish Rebuke
Description: Deal [Magic + 6] damage to an Enemy, boosted by their Attack. Gain 10 Souls. [1:1]
Mana Color: Yellow, Purple
Mana Cost: 15
Spell Id: 8298
Switch Release: Tuesday, Jan 1, 2030