Angel's Blade

You spend one turn charging this spell and the second turn is when it can be used. When the spell is in effect the sword that you have is surrounded in a blazing flame that does 1d4 radiant damage per turn to everyone in a 5ft radius except the wielder of the weapon. The new weapon acts like a unbreakable magical sword and now does 1d12 magical slashing damage and 2d20 radiant damage for every successful hit on the opponent. The sword will become un-enchanted whenever the wielder dispels it, is disarmed, or 10 minutes have passed. The swored radiates light clearly visible from 50ft away.