Quantum's Take

Black Adam is one of the more useful Legendary champions. He's the most obtainable Spiritual DMG champions in the game and the only one you can get as a new player without spending until The Joker shows up in the Bleed. What I like about him is you can build a budget Legion of Doom team using him instead of Sinestro or Deathstroke. As your roster progresses, he's going to taper off, but he's going to be usable in every game mode for the first month or two after you start, and for that reason you can get away with investing in the first level or two of his force.

Damage Type

Spiritual

Sources where available

The Bleed, Motherboxes (Green, Blue, Purple, Yellow), Random Legendary Shards

RavenHrt's Transmute Priorities

Energy Gain Bonus, ATK, Spiritual AMP

Recommended Legacy Pieces

Imp Doll

Multiversal Force Upgrades

Wrath - Enhanced

Reduces cooldown of [Wrath].

Judgement of Osiris - Enhanced

Increases Black Adam's Spiritual PEN.

Injustice Society - Enhanced

Increases Black Adam's Spiritual AMP.

Ultimate

Power of Aten

Deals Spiritual DMG equal to 220% of ATK to enemies within rectangular area in front of self

Global Skill

Wisdom of the Gods

Increases all Champions'Spiritual DEF.

Skills

Wrath

Deals Spiritual DMG equal to 155% of ATK to target and nearby enemies

Judgement of Osiris

Deals 6% more damage to enemies under 75% HP

Injustice Society

At start of battle, Black Adam's ATK increases by 6% for 20s