The Okamian Arms

Name: The Okamian Arms
What it's made from: Soul-Steel
What it can do: Though it's base form is a tanto dagger, the weapon is capable of shifting into various ninja weapons, each with a different effect. The weapons are the twin sythed kusarigami, the gaint Shuriken, the tanto, and the most powerful weapon,The dark Katana. These weapons are the only things it can transform into.
What it's for: To fight demons and other evil beings.
Weaknesses/Counters:In any form, it cannot damage blessed weapons and armor, nor can it damage holy beings(Like angels). The Devil Mode puts a strain upon his body, causing internal damage over time, and Flash Steps increase the strain.By the fourth, he's bleeding from nose and mouth, and when he exits out he drops, needing to rest for a few days.A powerful enough holy weapon can force him out of Devil Mode.He can't cut throug metal designed to be antimagic, and his weapon forms have certain thicknesses they can't peirce. Tanto, Sythes:5 inches, Shuriken: 10 inches(This seems to be mostly weight lending piercing power. )
Side-effects, if any:There are several effects, each belonging to a different weapon. The tanto: though this may be more of a mental thing, Toji seems to be more steathly using it. He also seems to grow a slight increase(10 miles) in speed. Kusarigami: The chain can stretch to a unlimited length. The Shuriken: Though very heavy, Toji can weild it perfectly, which implies it's capable of decreasing it's weight for it's true master. It also has a slight tracking ability, though nothing someone agile can dodge. The Dark Katana: A blade, fused with the soul of an Archdemon, is capable of cutting through demon metal and most known earth materials, it can also activate the Demon Form, a trait accessible only to Cheiftains and future cheiftains, which increases the weilder's ability's two fold, as well as making them more ruthless and harsh to enemies. (Note: The Dark Katana will only be summonable later on.) The Katana also allows him to flash step. Twice in regular form, four times in Devil Mode.
Creator: Hellbreaker
History (Optional):

done

I've added flash steps to the Katana, and added strain for the Devil Mode,as well as a powerful enough holy weapon being able to force him out of it.