Causes bombs to explode in a large cross-shaped blast by adding two additional explosions in each cardinal direction.
The damage for a single explosion is unchanged, but each successive explosion that hits the same enemy has its damage halved; for example, if 5 of the explosions hit the same enemy, the total damage is 60 + 30 + 15 + 7.5 + 3.75 = 116.25 instead of 60 * 5 = 300.
