Rolling Fire

You like to control fire in a different way than just throwing it at your enemies. You want them to see your fire rolling at them causing death and destruction as it goes.

Effect

Expending 6 mana points: you create a sphere that you can roll around and directed where you want it to go. This takes concentration. The sphere can be up to 3 feet in diameter The ball lasts as long as you keep concentration on it. Standing still and focusing on the movement of the ball does not require a concentration check, if you are hit, the DC is the damage you take, if you want to move or attack while keeping the ball active, you need to succeed a concentration check DC 5+ the number of rounds the ball has been active. If you fail the check the ball fades away. Those in the ball's path require a reflex save to take half damage. The attack deals 1d6 points of fire damage per Mana tree rank (maximum 6d6). The ball rolls at a rate of 20 feet per round, but if kept in a straight line, can move 30 feet.
Expending 10 mana points: This is a more powerful version of the 6 mana point version. This ball does 1d8 points of fire damage per Mana tree rank (maximum 10d8). The speed and duration are the same.
Expending 15 mana points: This version is faster than the 10 mana point version. It does the same damage but moves at a rate of 40 feet per round and can move 60 feet in a straight line.