Noxious Bog Wraith

create a mob that looks like a skeleton which has the following appearance: 'A mutant bogged mob, with custom effects and textures' and the following behavior/capabilities: 'Has 250 hp and does 5 hearts per hit, first attack shoots a lot of posion arrows at the player dealing 3 hearts per hit, second jumps up in the air and shoots in a ring of circles, then if the player gets to close it hits the player back for 5 hearts.'