The black blade of Maliketh

You posses the rune of death in one of your hands.

You create a collosal blade from your hand, for that you require to stab your hand were your rune of death is located to fuse it with your flesh.

You can choose to say: O, Death. Become my blade, once more. 

The blade emerges from the stabbing point as you pull the weapon back out, the dagger or blade used gets transformed into the new collosal blade, imbued in a dark and red fire, the essence of death itself.

Proficiency is not applied to this weapon due it's high power.

Damage scales according to the level your character has:

1–4: 1d10 slashing damage + (1d4 true damage +1) < true damage gets applied without exception and directly to the opponent

5–10: 1d10 + (1d6 +2)

11–16: 1d12 + (1d8 +3)

17+: 2d10 + (2d6 +4)

The range of the weapon itself is 20ft, but you can create fire slashes up to 60ft with the same damage for the same action.

This weapon was made to kill demigods..

Use it as you must.