The Vernon Spoilers consist of a Monster Manual describing the monsters of NetHack 3.3.1. Some players still use it today. They are here. Concerning monsters, the main difference between NetHack 3.3.1 and NetHack 3.4.0 is the replacement of the quest leader for the Wizard role. Thus the Vernon Spoilers contain an entry for the Wizard of Balance, while Ye Olde NetHack Bestiary contains an entry for Neferet the Green. The best monster spoiler may be monst.c, the source from which all other monster spoilers spring.