The bestiary lists all of Night-gazer Khighorahk's drops as p2p only but the Bathus Plateskirt, and likely the other f2p plateskirts, drop in f2p as well.

 

Sagitare, Shadow-forger Ihlakhizan and Bal'lak the Pummeller have all their drops listed as p2p only as well and, while I cannot confirm it at the moment, I suspect that the items available to f2p players drop on f2p servers.

 

Finally, Lexicus Runewright's entry lists the Salve, Blightleaf and Roseblood hoods in both the f2p and p2p section and, like the previous bosses, has f2p items listed as p2p only drops.

 

[spoiler=Proof of F2P Bathus Plateskirt Drop]

 

Yeah, anything tier 5 and below can be dropped by bosses. Mistake on the bestiary's parts I believe.

Thank you very much for your submission, this issue has been resolved :)