i did check the monoliths. but i tought the last one was past the queen somehow the whole time. my bad i guess.

also found out the item needed aswell -.- there was a small village near the boss altar and it contained something called FULING TOTEM. i never once saw such a thing before in all my plains time when gathering the black metal and ♥♥♥♥ and raiding villages. heck port marble was build where once a village was. and that is the first time i found such an item. and you need 5 of them. thats gotta be awhile anyway before i bother to find the other 4.
unless this one respawns after awhile. will see.