The first shot of the weapon is completely normal up until it is almost about to hit the ground. Right at that moment, a new shot forms out of the original one and makes a small shot that goes further away. Both the original and newly created shots do 20 damage and have a decent sized blast radius.
This tier acquires the same attributes as tier one, except it makes 3 extra shots instead of one. All new projectiles forming off of the newly created ones. Again, all of these shots do 20 damage and have a decently sized blast radius.