In the original White Plume Mountain,
at the end of one of the corridors (in area 27) there is an ogre mage named Qesnef, described as follows:
> AC: 1, HD: 5+2, MV: 9"/15", HP: 35, AT: 1, D: 1-12, SA: [irrelevant], SD: Regenerates 1 point per round also wears a Ring of Protection +3 on his left hand and a Ring of Mirror Images (5 charges) on his right.
How does one determine this monster's actual AC? In other words, is the Ring of Protection +3 already factored in to the listed AC of 1?
This sort of monster is usually AC 4, which would seem to imply that the Ring is factored in, but being a unique/named monster I wasn't sure if there was some special rule that applied.