It is said that when a Blue Mage is no longer able to control the beast within as a side effect of using Blue Magic, they lose the ability to maintain their mortal form and are transformed into Soulflayers.
Soulflayer (CR 6)
AC 17, touch 13, flat-footed 14 (+3 dex, +4 natural)
hp 68  (8d10+24)
Fort +5, Ref +9, Will +8
DR 5/cold iron or good; Immune fire, poison; Resist Dark 5, Earth 10, Ice 10; SR 19
Speed 30 ft.
Melee 4 Tentacles +9 (1d4+1 plus grab) or Quarterstaff +10 (1d6+1)
Special Attacks Mind Blast, Mind Purge, Thought Tentacle
Spells Known (FC CL 8th, Concentration +13)
1st (DC 16) – Blood Drain, Marrow Drain, Seed Cannon, Water Gun
2nd (DC 17) – Acid Droplet, Hear no Evil, Snowpit, Telekinetic
Str 12, Dex 16, Con 16, Int 20, Wis 14, Cha 16
Base Atk +8; CMB +9 (+12 vs grapple); CMD 22 (24 vs grapple)
Feats Combat Casting, Improved Grapple, Improved Initiative, Weapon Focus (quarterstaff)
Skills Bluff +15, Diplomacy +15, Escape Artist +15, Intimidate +15, Knowledge (Arcana, Planes, Religion) +17, Perception +14, Sense Motive +14, Spellcraft +17, Stealth +15
Languages Abyssal, Celestial, Common, Draconic, Undercommon, telepathy 100 ft.
Mind Blast (Su)
Soulflayers are able to project a 60 foot of psychic static towards a single target. The target is stunned for 1d4 rounds and takes 8d6 points of non-elemental damage. A successful Will save (DC 19) reduces the damage by half and negates the status effect. This ability is used as a standard action is considered a mind-affecting effect and the saving throw DC is Charisma-based. Blue mages may learn this ability as a 5th level spell (Knowledge: Dungeoneering DC 25).
Mind Purge (Su)
Soulflayers are able to enter the mind of their target and purge one of their benefits from their victim. This spell functions as Dispel. Blue mages may learn this ability as a 3rd level spell (Knowledge: Planes DC 21).
Thought Tentacle (Ex)
If a soulflayer has someone grappled and successfully deals damage to that target, instead of the normal physical damage, it can choose to deal 1d4+2 points of Intelligence damage instead. This ability only works on creatures with an actual brain. Thus, it does not work on constructs, elementals, plants, oozes or undead in addition to creatures that either do not have an actual brain or the brain is not physically inside the grappled creature.