A half-fiend snake/treant would be where I either put claws on the wings and let it attack that way or just replace the claws with wing attacks.
Like this...
Unnamed Hero CR 11
XP 12,800
Half-Fiend Treant
NE Huge outsider (plant, native)
Init +0; Senses darkvision 60 ft., low-light vision; Perception +24
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Defense
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AC 23, touch 8, flat-footed 23 (-2 size, +15 natural)
hp 138 (12d8+84)
Fort +15, Ref +4, Will +11
DR 10/magic, 10/slashing; Immune mind-affecting effects, paralysis, poison, polymorph, sleep, stunning; Resist acid 10, cold 10, electricity 10, fire 10; SR 22
Weakness vulnerability to fire
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Offense
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Speed 30 ft., fly 60 ft. (good)
Melee bite +18 (2d6+11) and
. . 2 claws +18 (1d8+11) and
. . 2 slams +19 (2d6+11/19-20)
Space 15 ft.; Reach 15 ft.
Special Attacks double damage against objects, rock throwing (180 ft.), smite good, trample (2d6+16, DC 27)
Spell-Like Abilities (CL 12th; concentration +14)
. . 3/day—darkness, poison
. . 1/day—blasphemy, contagion, desecrate, unholy blight
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Statistics
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Str 33, Dex 10, Con 25, Int 14, Wis 20, Cha 15
Base Atk +9; CMB +22 (+24 sunder); CMD 32 (34 vs. sunder)
Feats Alertness, Improved Critical (slam), Improved Sunder, Iron Will, Power Attack, Weapon Focus (slam)
Skills Bluff +14, Diplomacy +14, Fly +15, Intimidate +14, Knowledge (nature) +14, Perception +24, Sense Motive +21, Stealth +7 (+23 in forests); Racial Modifiers +16 Stealth in forests
Languages Common, Sylvan, Treant; treespeech
SQ animate trees, hero points
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Special Abilities
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Animate Trees (Sp) A treant can animate any trees within 180 feet at will, controlling up to two trees at a time. It takes 1 full round for a tree to uproot itself, after which it moves at a speed of 10 feet and fights as a treant (although it has only one slam attack
Blasphemy (1/day) (Sp) Granted by Half-Fiend heritage.
Kills, paralyzes, weakens, or dazes nonevil subjects.
Contagion (1/day) (Sp) Granted by Half-Fiend heritage.
Infects subject with chosen disease.
Damage Reduction (10/magic) You have Damage Reduction against all except Magic attacks.
Damage Reduction (10/slashing) You have Damage Reduction against all except Slashing attacks.
Darkness (3/day) (Sp) Granted by Half-Fiend heritage.
20-ft. radius of supernatural shadow.
Darkvision (60 feet) You can see in the dark (black and white vision only).
Desecrate (1/day) (Sp) Granted by Half-Fiend heritage.
Fills area with negative energy, making undead stronger.
Double Damage Against Objects (Ex) If this creature makes a full attack against an object or structure, it deals double damage.
Energy Resistance, Acid (10) You have the specified Energy Resistance against Acid attacks.
Energy Resistance, Cold (10) You have the specified Energy Resistance against Cold attacks.
Energy Resistance, Electricity (10) You have the specified Energy Resistance against Electricity attacks.
Energy Resistance, Fire (10) You have the specified Energy Resistance against Fire attacks.
Flight (60 feet, Good) You can fly!
Immunity to Mind-Affecting effects You are immune to Mind-Affecting effects.
Immunity to Paralysis You are immune to paralysis.
Immunity to Poison You are immune to poison.
Immunity to Polymorph You are immune to Polymorph effects.
Immunity to Sleep You are immune to sleep effects.
Immunity to Stunning You are immune to being stunned.
Improved Sunder You don't provoke attacks of opportunity when sundering.
Low-Light Vision See twice as far as a human in low light, distinguishing color and detail.
Poison (3/day) (Sp) Granted by Half-Fiend heritage.
Touch deals 1d10 Con damage, repeats in 1 min.
Power Attack -3/+6 You can subtract from your attack roll to add to your damage.
Rock Throwing (180 feet) (Ex) You can throw big rocks. They hurt.
Smite Good (1/day) (Su) +2 to hit, +12 to damage, +2 deflection bonus to AC when used.
Spell Resistance (22) You have Spell Resistance.
Treespeech (Ex) Members of this race have the ability to converse with plants as if subject to a continual speak with plants spell.
Unholy Blight (1/day) (Sp) Granted by Half-Fiend heritage.
Harms and sickens good creatures (1d8 damage/2 levels).
Vulnerability to Fire You are vulnerable (+50% damage) to Fire damage.
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