Ok, because I needed a Tales of Wyre fix and also because I know we all love him, using the 3.5 Rules I bring you the one, the only...
Mogus the Hedgehog (CR 16)
Pseudonatural Familiar
Tiny Outsider (Augmented Aberration, Native)
Hit Dice: 15D4 (228hp) – Half of Mostin
Initiative: +6
Speed: 10ft.
Armor Class: 55 (+4 size, +6 Dex, Natural Armor +35), touch 55, flatfooted 49
Base Atk/Grapple: +15
Attack: +21 tentacle rake (2d8+6)
Full Attack: +21 melee, 4 tentacle rakes (2d8+6)
Special Attacks: Improved grab, rotting constriction, spell-like abilities
Specal Qualities: Alertness, cannot be flanked, constant insight, Improved Evasion, damage reduction 15/epic, darkvision 120ft., immunities (acid, electricity), SR 75, Share Spells
Saves: Fort +16 Ref +17 Will +24
Abilities: Str 23 Dex 22 Con 21 Int 20 Wis 24 Cha 4
Skills: Hide +26, Listen +9, Spot +9
Feats: Alertness.
Metagnostic Form (Su): As a free action, Mogus can change form between a hedgehog and a writhing mass of tentacles, or any combination in between. Typically, he appears as a hedgehog with vestigial alien features. A true seeing spell reveals Mogus as existing in all forms simultaneously. In his tentacled form, Mogus may use Improved Grab and Rotting Constriction in addition to his other abilities. In this form, nonpseudonatural enemies suffer a –1 morale penalty on their attack rolls to hit Mogus; creatures using true seeing automatically incur the penalty.
Mogus's metagnostic form is not subject to dispel effects, but within an antimagic field Mogus may not change form and retains whichever shape he possessed before entering the field.
Improved Grab (Ex): If Mogus hits an opponent of Tiny-size or smaller with a tentacle, he deals normal damage and attempts to start a grapple as a free action without provoking an attack of opportunity.
Rotting Constriction (Ex): Once Mogus has hold of an opponent, each successful grapple check he makes during subsequent rounds permanently drains 2d4 points of Constitution. At the same time, Mostin regains 10 lost hit points.
Spell-Like Abilities: As a standard action, Mogus can use blur, haste or dimension door. Caster level 20th.
Dont mess with the Mogus.