Testament is a hidden character that must be unlocked. Being a boss, he is a power character. Although very over looked, Testament is a force that can be the best character in the game if played with right. If you can use Testament properly, there will be no need for blocking.

Moves List

Targetting Skull - QCF+P or K (If this hits the opponent, the Crow will start to attack the opponent with random attacks.)
Grave Digger - QCB+P
Demon Summon - HCF+S or HS (S brings it from behind while HS brings it from the front.)
Standing Counter - QCB+S (Anytime while Testament is still in the pose, and the opponent hits him with any blockable move, Testament will teleport behind the opponent and hit them with a Blood Hurricane. This will poison them. Poison drains their life down slowly until you are hit or it wears off. This can bring the opponent down to the minimal life possible, but it can't kill them.)

Overdrive Attacks

Poison Demon Summon - HCB,F+HS (Poisons the enemy which drains their life down slowly until you are hit or it wears off. This can bring the opponent down to the minimal life possible, but it can't kill them.)

Instant Kill

Press All 4 Buttons to activate the "Attack Mode" then while in it:
Double Scythe End - QCFx2+HS (close)

Combos

P, K, S, HS, QCB+P
Follow what is said and you have a 5 hit combo.

Guilty Gear Mode Changes

Testament's Targetting Skull comes out slightly faster. Other than that, nothing much.

Gold Form Changes

He is faster and does more damage. He also seems to have no recovery time on some attacks that he had a recovery time on before.