I still hold the opinion that the Fiend Folio must be slain such that it may be reborn in mine own image or whatever. So: to it...
Elemental Princes of Evil
A little more elegant than "Princes of Elemental Evil" but it still sounds half-literate. Anyway, no need for all this Gygaxian symmetry (there's five of them anyway) we just need to remember:
-there's some big monsters
-they have elementy-powers
In true Deities and Demigods fashion, the implication is mostly that what these august entities do is wait at the end of dungeons to shoot you with rays and punch you, and that idea needs lots of help, but you are wily and wise and a Prince of Fire is totally work-withable, so I'm just going to work on how they look here.
Cryonax. (The Cold one.)I like the name...he is a 15' tall tentacled yeti which sounds pretty great except it just sort of makes him a Demogorgon wannabe so instead he is this icy fellow with a polar worm on his icy shoulder...(click upon him and his fellows to enlarge them)Imix. (The Fire one.) The Prince of Burning Things appears as an 18' pillar of fire whichOhmygod, hold on...ugh...sorry, I was almost bored to death there. Whew. Anyway, yeah, right, pillars of fire are only interesting in the Bible. So I decided he's curly pointy screamy salamandery guy on top of a volcano.Ogremoch. (The Earth one.) Anything beats looking like sad dough. Let's say he's like a big mountain monster.Olhydra (the Water one) and Yan-C-Bin (the Air one) look like blobs of their respective elements and have names that look like what's left on the floor after pasting together a ransom note. I hereby dub this 40' tall rotting fish and extraneous-eyed bird Alladra and Ancibin and declare them superior...
If all your players are girls who have at one point or another been paid to take off their clothes while "Closer" is playing you pretty much have to have them in the game and you have no choice so no use worrying about it. Word. (Which is "Drow" backwards.)
Truth in advertising here in the Fiend Folio (at lest until we get to Eye Killer). Basically it's like Rogue from X-Men only instead of being hot and trashy and streaky it got designed during the same sleep-dep-and-Pilsbury binge that produced Ogremoch. I have changed him from one blobby sad fat foe into smaller organisms that crawl and corrupt and join up like mad plasm. It combines blobbing over your weapon-hands with a choke attack. It's one of those your-friends-should-probably-notice-what's-going-on-halfway-through-and-help-you-out monsters, so horror and painful slowness are important elements here.
More proof that the Fiend Folio authors were sucking down the Jim Shooter-era Marvel Comics, the ettercap is Spider-Man, only as a dumb generic goblinoid. Kinda pointless in a game that already has nine hundred types of giant spiders and is going to have driders in a few years. As Steve Ditko could've told them, there is no point in combining people parts with spider parts unless you can make the result look totally fucked......an ettercap is what happens when the giant spider manages to lay eggs in a halfling's brain. The web comes out of its mouth.
It neither is a killer eye nor does it kill eyes. But then that's Native American names for you--Joey Running Deer isn't a deer nor does he run with deer. I don't think. Is it a Native American monster? I think I read that somewhere (maybe in the Marvel Comics where they had recently appeared when the Fiend Folio was published...).
Anyway the original Folio killer is a batsnake in a game that needs neither more bats nor more snakes. This one is a worm with bat wings and a claw around its mouth that it uses to pull your eyes out. Yes, the game needs more claws, worms, and deoculization.
Eye of Fear and Flame
"The nature of the deeds will vary but they will be uniformly evil". I will not attempt to fix that which is not broke.