Saeviomagy
Adventurer
The major problem with a LOT of critters in 3rd ed is that offensive power is rated highly, and defensive power is rated significantly less highly.
The simple fact of the matter is that unless a critter has hitpoints, or a very good chance to surprise it's opponents, all the offense in the world cannot save it. You're much better off just using a trap.
Example: The beholder. CR 13, and only 60 hps, and no significant defenses. 60! I've seen 9th level mages with that many hitpoints.
So why's it CR 13? Because it's dangerous if it ever actually gets a go.
Same goes for the maralith, or the medusa, or many undead critters (thanks to the turning power of the average cleric...)
The simple fact of the matter is that unless a critter has hitpoints, or a very good chance to surprise it's opponents, all the offense in the world cannot save it. You're much better off just using a trap.
Example: The beholder. CR 13, and only 60 hps, and no significant defenses. 60! I've seen 9th level mages with that many hitpoints.
So why's it CR 13? Because it's dangerous if it ever actually gets a go.
Same goes for the maralith, or the medusa, or many undead critters (thanks to the turning power of the average cleric...)