void metal; a substance as strong as titanium while also splitting in half all magical energy it comes in contact with until contact is lost, The metal could withstand heats that of the sun and colds reaching absolute zero, Electricity it did not conduct and neither was it magnetic.
Void metal tends to have a strange effect of spirits making there from turn unstable and if a spirit holds contact for long enough it will siece to be.
A void metals durability depends on the thickness and the amount of void metal it's made off for example 1cm thick would be iron or steel and 2 cm steel or tempered steel then at 5 cm it gets as strong as titanium Though it doesn't go higher.Void metal is extremely heavy, Miresis armour for example weighs 10 tones and his sword weighs half a tone.
If void knights learn enough they can create void metal with special characteristics take Miresis sword for exampleThe instant the blade came in contact with another metal alloy the blade would vibrate at a molecular level braking up the molecules in the other metal effectively through it.
There able to give them many other abilities though it usually either comes at the Cost of time or the sacrifice of another characteristic.