Weeping Writer's Decay

You are able to channel the ink from the bottle into a spike of deathly energy (looking similar to the end of a quill. Once you aim and fire the "spike of death", the target begins withering away, with inky black smoke consuming them and excreting out of them. the initial attack will give 56 hit points. Each creature in that area must make a Constitution saving throw. Constructs, devils, and undead aren’t affected, and plants and water elementals make this saving throw with disadvantage. A creature takes 12d8 necrotic damage on a failed save, or half as much damage on a successful one. over the course of 3 rounds, more hit points will be taken. 

Nonmagical plants in the area that aren’t creatures, such as trees and shrubs, will also be affected, as they wither and die slowly.