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.
Unique maple staff in Fallout: New Vegas' fourth DLC, Lonesome Road. - the highest critical damage of all playable melee weapons, 80. The fact that the Blade of the East has a bit higher ciritcal damage (98), means nothing, since you cant play much with that weapon.