This spell does not have a direct equivalent in vanilla.
Monster Summoning VI
Level: 6
School: Conjuration
Range: Medium
Duration: 3 turns
Casting Time: 1 round
Area of Effect: Special
Saving Throw: None
By means of this spell, the caster summons a number of monsters, which serve the mage under any conditions. The type and number of creatures that appear depend upon the level of the wizard casting the spell. The summoned creatures will remain under the wizard’s control until they are slain or the spell duration expires.
11th : 2 baby wyverns
15th+ : 2 baby wyverns, 1 wyvern
Baby Wyvern (6 Hit Dice):
STR 17, DEX 12, CON 15, INT 6, WIS 11, CHA 9; AL Neutral Evil
HP 78, AC 3, THAC0 12, Saving Throws 11/15/11/13/15
4 Attacks Per Round, 2d6+3 Piercing Damage (Bite, Claws, & Sting +1)
Wyvern (7 Hit Dice):
STR 19, DEX 12, CON 15, INT 6, WIS 12, CHA 9; AL Neutral Evil
HP 91, AC 2, THAC0 8, Saving Throws 10/14/10/12/14
4 Attacks Per Round, 2d6+9 Piercing Damage (Bite, Claws, & Sting +2)
Combat Abilities:
Poison: a wyvern’s sting injects a poison which inflicts 2hp/sec for 1 turn (save vs. poison at -4 neg.)
Special Qualities:
Immune to entangle, grease, hold, sleep, slow, stun, & web effects