As the shards reporter, I'm wondering why you think the shard needs such an extravagant item?
As for chain explosions... what are we talking about with accuracy? Have you tried throwing 3 things at a moving, or stationary, target with perfect accuracy? This experiment is not going to go well; and will likely just get worse if you go beyond 3 tossed bombs in succession.
Hey I get it, this is a fantasy game; but even energy bolt and fire ball have a cool down-- not to mention an interrupt-- featured in.
If anything, we should be asking for Explosion potions which do more damage. Explosive Keg any one? [125 str and 135 dex requirement]
Just my two cents.