Raven Crowking said:
Brachiosaurus (100)
Hydra (by heads, ranges from 30 to 192, athough maxes out on 48 per character)
Pyrohydra (by heads, ranges from 30 to 120, without breath weapons, although maxes out on 40 per character)
Mammoth (76)
Average hit points for a 10th level fighter is 10 x 5.5 = 55 plus Con bonus x 10, say an additional 20 hp to be generous, for 75 hp.
Fighters have a maximum of 9d10 hit dice, +3 hp per level after that.

The Con bonus only accumulates to level 9, and is ignored subsequently.
Does Gary have an elephant fixation or what? Most of the high-damage creatures are elephants! Poor Pit Fiend!
I did allow the brachiosaurus to step on its victim (max damage 80), but otherwise ignored special attacks. In the case of the 1e carrion crawler, 6 attacks lead to 6 chances to be paralyzed. How long does that paralysis last?
Until Doomsday, I guess.
In the case of energy drain monsters (max loss of 2 levels in AD&D 1e), hit point loss occurs from the level drain itself.
Yep. A 15th level Magic-User who gets energy drained 2 levels only loses 2 hit points, but you can hear the screams around the world.
Interesting note: if a party faces an energy drain creature, they only want one or two PCs to lose levels. That way, they can keep adventuring with the other PCs and thus gain XP quickly, and much more rapidly attain the level they were on. If every PC loses 2 levels, it's a real pain.
e.g. A group of 6 characters (F7, F7, MU7, MU7, C7, T8) encounters a vampire. The Fighter and MU both are drained to 1st level. By the time the other F7 reaches F8, the new F1 and MU1 will have reached F6 and MU5; by F9, we have F8 and MU9!
Add special abilities, and the 1e DM can make 10th level PCs drop like flies, if that is his goal. As can the 3e DM, really.
Indeed. I'm just interested in how deadly 1e monsters actually could be in melee; it's something I haven't really investigated before. I've sort of looked at orcs and goblins that have pretty low damage die, and giants to a certain extent, but not really at the Big Brutes of 1e.
A F10 has about a 50% chance of failing any saving throw - 45% fail chance against death/poison. At F12 it has reached 30% chance of failing. So, poisonous creatures are always of concern to the Fighter. (Hmm - 1e Slow Poison will work even if cast on a "dead" PC if cast within the time limit; does this apply to Neutralise Poison as well?)
Cheers!