Quicksilver Flail

Damage. 1d8+1 Acid   Liquid Flail. You gain a +1 bonus to attack rolls you make with this weapon.   Blessed Silver. When you successfully hit an Undead creature with this weapon, it deals an extra 1d8 Acid damage.   Lob Blob. You can use an action to hurl the ball of this flail to a location within 45ft. of you. All creatures within a 5ft. radius of the point of impact have to make a Dexterity saving throw (DC 15). On a failed save they take 4d4 Acid damage. Afterwards, the drops of quicksilver float back towards the flail and the weapon reforms at the start of your next turn. Until it is reformed, you cannot make an attack with this weapon. You can use this feature twice per long rest.