Hexaxe

Alter: This handaxe amplifies curses bestowed on its enemies. The weapon has 3 charges and regains all charges daily at dusk. While you're holding the axe and are forced to make concentration check, you can use your reaction to expend 1 charge to add your Charisma modifier to the total of the saving throw.

You gain a +1 bonus t attack and damage rolls made with this weapon against creatures under the effects of a spell you cast and are concentrating on.

Attunement: Warlock
Rarity: Uncommon
Type: Handaxe
Cost: 75gp

Griffons Saddlebag, Vol 1