well i did beat him with a iron bow and a simple "trick" or "cheat" whatever, its pretty boring and u aint need much.

just dig a hole. so u can stand in and then close up the top, but let 1 block free through which u shoot arrows at it. it takes a fucking while but its easy that way. but be carefull.... it happened that he shoot his mega laser into the hole once to me. lucky i respawned fast enough made another hole and kept going..