Since Roman times, people have associated the hand's fourth digit with the wearing of rings. In many cultures, a proportionally longer ring finger in men has been taken as a sign of fertility.
The ball explodes on impact, knocking enemies to the ground and dealing 1d3+3 fire damage per two caster levels (a successful Reflex save reduces the fire damage by half and negates the knockdown effect) and 1d2+2 force damage per caster level (no save) to targets in the area.
If your Nether Portal is hit for a second time by a Ghast, it will relight it, so try and get a Ghast to attack you while you're standing by your Portal. All the components to make a Fire Charge can be found in the Nether. 1  Blaze Dust: Kill Blazes.  Gunpowder: Kill Ghasts.