Minor force oozes are formed from the residue magic of the countless magic missle and mage armour spells cast in dungeons and on battlefields.
It appears to be a spherical, twisting ball, formed by dozens of force bolts folding in on themselves. A pale blue nimbus surrounds it.
Minor Force Ooze CR 2
N Medium Ooze
, Senses ; ; Blindsight 60'
AC 13, touch 10, flat-footed 13 (+1 deflection, +4 magic armour, -1 Dex)
hp 5 (HD); DR 10/magic
Immune poison, sleep, paralysis, polymorph, stunning, critical hits, flanking; SR 11
Melee Slam +0 (1d4) plus magic missile
Space 5 ft.; Reach 5 ft.
Special Actions Spell Effect, Engulf DC 11
Abilities, , ,
SQ Ooze traits (Mindless, blind)
Environment Dungeons, battlefields
A minor force ooze without the mage armour spell has AC 11 and is CR 1.
Spell Effect (Su) If a minor force ooze attepts a slam attack at an opponent, it also unleashes a magic missile, which strikes unerringly causing 1d4+1 force damage; this occurs even if the slam attack misses.
Engulf (Ex) Ooze may move into opponent's space; Opponent gets attack of opportunity or a reflex save of DC 11. If save is made, opponent is pushed back or aside, otherwise opponent is considered grappled and suffers a magic missile strike each round.
The Living Spell template from Monster Manual III has been used; I've allowed the magic missile spell effect to occur even if the ooze misses with its slam attack, and I've allowed a permament mage armour effect. Both, I think, are in the spirit of the spell descriptions and Living Spell template, and easily covered by the creature's CR of 2.