Mermutany

Mermutany is a NPC that can be found everywere with a frequency of 50%, she can be found with a siren costume or with a minishark , after killing skeletron prime mermutany will have a megashark instead of a minishark.

Buyable objects
Glowsticks - 10 - when has the siren costume

Bullet - 7 - when has the minishark

Meteorite Bullet - 1 - when has the minishark

Siren Machinegun -10 - Everytime

Clorophite bullet - 10 - After all mechanical bosses were killed, when has the megashark

Trivia
The mermutany was created by zjboy, a youtuber that makes terraria animation