Research:Ninja Belts & Headbands
Inazuma: With a total of 6 inhumes I couldn't buy the black belt. Inhumed Thursday 4 times, Dibhala and Fivespoon once. Possibly it's the number of different people, possibly the number of players inhumed..
Inazuma With 5 unique npc contracts, black belt comes available... Incorrect. Possibly 5 ninja inhumes or unique ninja inhumes.
Inazuma: albert+dibblerx2+thursdayx4+dibhala+fivespoonx2+stavic = brown belt
Inazuma: albert+dibblerx2+thursdayx4+dibhala+fivespoonx3+stavic = black belt
Colour is determined by total (not unique) amount of contracts closed for the Ninja Guild.