From Brotato Wiki
+4% Explosion Size for every 1 Elemental Damage you have
Armor modifications are reduced by 50%
How to Unlock
Kill 15 Enemies with a single explosion
Unlocks Explosive Shells if you win a game with Artificer:
Their arsenal consists mostly of Explosive Damage weapons and Engineer weapons. It is worth noting that turrets deal damage as normal, and if you get to tier 4 (red) wrenches, the explosive turrets will benefit from your explosive bonuses. Landmines also benefit from these. But since they are Tool weapons and not Explosive, you will be dealing 1 damage with each hit, making them significantly harder to use in the early game.