Bug Problem

The caster puts the assorted bug parts in their mouth, rear back and swallow. On their next turn they can create a 15ft cone in front of them that deals 5d10 necrotic, this does NOT get rid of their action for that turn, and the cone stays for 1d4 turns, dealing 1d10 necrotic per turn. The cone is considered a monstrosity and can be targeted by attacks, because it is a mass of bugs: all attacks (except spells) on the monstrosity have disadvantage on that attack.