My Roomate (the lawyer) always likes to argue the opposite side and play devil's advocate. He made the argument that WS is only size altering if you alter your size. meaning if you human WS to a Black bear then you're still a valid target for Animal Growth.
He then proceeded to make the arguement that the reason why the disclaimer: Effects that increase size do not stack is not written in the text was because size is not always increased with WS. you could be small and decreese size. for example.
IMO the Natural Form argument is stronger, although I could just as easily see it his way - if polymorph said something about changing size.-- I think it just says: Take the form of. . .
Lastly, in reply to my post about the panda stats (What do Yall think?):
Panda Bear
Medium Animal
Hit Dice: 4d8+8 (26 HP)
Initiative: +1
Speed: 30'(Walk), 20' Climb
Armor Class: 14(+1 Dex, +3 natural), Touch 11, Flat Footed 13
Base Attack/Grapple: +3/+8
Atack: Claw +8 (1d4+5)
Full Attack: 2 claws (1d4+5), Bite (1d6+2)
Space/Reach: 5'/5'
Special Attacks: Improved Grapple
Special Qualities: Lowlight Vision, Scent
Saves: Fort +6, Ref +1, Will +4
Abilites: Str 21, Dex 13, Con 15, Int 2, Wis 10, Cha 8
Skills: Climb +5, Listen +5, Spot +3, Survival +5
Feats:Endurance, Track
Environment: Tropical Forests
Organization: Solitary (Or Pair)
Challenge Rating: 3
Advancement: 5-6 HD(Medium), 7-8(Large)
Level Adjustment: - (+2 chohort)
The Panda bear is a Jungle-dwelling omnivore that usually is not dangerous unless an interloper threatens its cubs or food supply.
Panda bears can be pure black, albino, but mostly Black and White in color and are rarely more than 6 feet long.
Skills: Panda bears have poor eyesite but gain a +2 bonus to survival checks to track prey, and a +2 to listen checks due to their keen hearing.
Combat
Improved Grab: When a Panda Bear hits with a claw attack, he may initiate a graple as a free action. He gains a +4 Racial Bonus on this roll.
Panda bears rip prey with their claws and teeth.
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