Pet Mage (D&D balance)

Entry Point
Level 5-6	+0
Relative Cost
Takes ½ of available feats	-1
Takes almost all available feats	-2
Takes ½ of available skill points	-1
Takes almost all available skill points	-2
Requires many specific spells (only classes with a limited spell list)	-1
Requires multiclassing	-2
Prerequisites
5 ranks of skills	-1
Each feat or selective class ability	-1
Class Abilities
Gain or lose the use of armor proficiency feats	+2
Level-developing ability (turn undead, companion, AC bonus etc)	+2
+2 skill points/level	+2
+1 hit point/level (one increment of hit dice)	+2
Each category increase to base attack bonus (2/4 -> 3/4 -> 4/4)	+2
One extra good save category	+2
Arrested familiar/companion development	-2
Each entry in the special section of the class progression table	+1††
+1 level of bard, cleric or druid spellcasting	+1††
+1 level of sorcerer/wizard spellcasting	+3††
Each spell level of prestige-class-specific spells	+1††
Total

†† Double these costs for a three-level prestige class and increase the cost by 50% for a five-level class.