Item Drops and Finds Version 2 - Post BB

i've not tried the pq yet myself (or with a party for that matter), but what from and how often do the alien fragment accessories (and hat, if possible) drop? thanks

There are 2 bosses (in 3rd and 5th stage).
Both of them can drop items, tho the one in 3rd stage gave me only 1 drop in like 30 runs so far.
Last boss has like 60% droprate i think (at least from my own experience using 1.2x pendant + spider familiar).

Also last boss can spawn in 3? forms i think.

Alien visitor > rare alien visitor > mysterious visitor (tho never had this one)