monster manual 2
some notable ones from the MM2
Jarilith (tanar'ri) - Frightful Presence, Improved Grab, Pounce, Augmented Criticals, Rake, Scent, SR 25 - nasty combat machine
Kelvezu (tanar'ri) - Poison, Sneak Attack +8d6, Evasion, Uncanny Dodge, SR26 - who needs an assassin?
Nimblewright - Tripping Thrust, Augmented Criticals, SR 27
Phoenix - Shriek, SR 35, Uncanny Dodge, Spell-like metamagic (only useful if you have spell-like abilities to begin with)
Chain Golem - Magic Immunity, Chain Barrier, Wounding
Bone Ooze - Ability Drain (1d6 each Str, Dex, Con every hit, no save), Bone Meld (DC 35 or die effect), wounding (5/round), Engulf (auto slam, ability drain, and wound damage every round), Blindsight
Rampager - Acid (dc 22 or destroy armor) Armor Damage, Fear Aura, Scent, Poison
Runic Guardian - Stunning Strike, Guard, Fast Healing 10,
Spellgaunt - Enhanced Bite (acts as +4 magic weapon), Snatch Item, Quick Leap, SR 35
Spellweaver - Shielded Mind, Spell Weaving, Immune to Mind affecting effects, SR 21