Cluster Grenade

A mysterious white crystal which seems to be made out of gemstones shards. It burns brightly and seems that when it hits something it can explode into a blinding flash which deals 2d12 radiant damage in a 10ft sphere. This also is guaranteed to blind anyone who is hit by the explosion. This item however is in limited stocks. This however needs to be tossed which can be moved within 30ft of the user. It takes an action to use and increases in damage at certain levels. At level 4 it becomes 3d12, level 8 it becomes 4d12, level 12 5d12 and finally at level 16 it becomes 6d12.