He reduces the cost of other dark knights -2 by being in the team.
His skill reduces enemy dmg by 50%
Some other stuff that i cant rmb
The 1000 represents 1000 rainbow crystals. I think you get those from selling black/plat units. I'll hear about it but no way i am going to test it out. This black knight represents the rich dmm spenders who have excess black/plats.