My Polymorph Self/Other: Good, Bad or just Ugly?

Dog Faced God

First Post
Here's my house ruled Polymorph Self/Other. Anyone think this is too powerful, not powerful enough, or just right? Opinions please!!

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Polymorph Self
Level: Sor/Wiz 4
Components: V,S,M
Casting Time: 1 action
Range: Medium (100' + 10' / level)
Target: One Creature
Duration: 1 hour/2 caster levels. (D)
Saving Throw: Fortitude Negates
Spell Resistance: Yes


The character can take the form of another creature. During the course of the spell the spell caster can alter the form once, and one additional time per three caster levels (for example, a 9th level spellcaster could change form 4 times during the spell). Changing form is a full-round action. A spellcaster has a limited number of known forms. This is equal to their Knowledge (Nature) modifier (ranks+INT modifier+misc).

When a spellcaster changes form, they regain 1d4+CON hit points. Any corporeal form may be assumed, so long as the size of the assumed form is no smaller than Diminutive, and no more than one size category larger than the caster's normal form. Only natural abilities of the assumed form are acquired by the subject of the spell. Natural abilities are any abilities not classified as extraordinary, supernatural or spell-like, and are not inherent as a result of type or class (the caster retains his own type and class).

Mental ability scores (INT, WIS, CHA) do not change. Physical ability scores only change as a result of a change in size as noted below:

New Size: STR* DEX* CON*
Large +8 -2 +4
Small -4 +2 -2
Tiny -8 +4 -2
Diminutive -10 +6 -2
*minimum ability score: 1

The caster can freely choose secondary characteristics such as gender, race, apparent age, skin/hair/eye color, etc.

Changes to equipment can alter their form, function, or damage. Upon casting the spell, the caster may choose to have any currenlty carried or worn equipment meld with your new form. Items melded in this fashion are non-functional, save for magic items with continuous affects. Items not melded that cannot be used by the new form are dropped. Weapons can be made larger or smaller to accommodate the caster’s new size. Weapons changed in this manner retain all their original properties save for damage die. For every size category added or subtracted the damage die becomes the next lower damage die. For example: a shortsword (a small weapon, 1d6 damage) made into a medium-sized weapon would deal 1d8 damage. A weapon that deals 1d12 damage that is made larger deals 2d8 damage. 1d3 is the least damage a weapon will deal as it is made smaller. If equipment, weapons, or any part of the caster’s body is separated from the caster, it immediately reverts to its original form.

Extremely high movement rates (i.e. non-flying speeds above 60, flying speeds above 120) are not granted by Polymorph Self. If the character is slain while in this form, the character retains this form.

If the character uses this spell to create a disguise, the character gets a +10 bonus on the character's Disguise check.

Polymorph Other

As Polymorph Self except:

The subject of the spell gets a bonus to their saving throw (if not voluntarily failed) based on how radically different the new form is from their normal form.

+1 per size category difference
+1 for changing to a different type (humanoid to animal)

Additional bonuses may be applied or ignored at the DM’s discretion. For example, changing the Tarrasque into a minnow is quite a radical change, and might grant more than a +1 bonus to the save.
 
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It's not a bad idea. The problem, though, IMO is that the physical stats basically have no relation to the creature in question. They're only determined by size. Just looking at the amount of variation I see in Medium creatures in the MM, this could cause problems. Pick a creature with weak physical stats but good attacks/specials.

While I like the idea of limiting known forms, I'd be careful using Knowledge (nature), as you'd basically be hosing Sorcerers without affecting Bards or Wizards at all. Probably still the best way to do it, though.

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What I did instead was make Polymorph Self and Polymorph Other act like Teleport; that is, you roll on the Teleport table based on how familiar you are with the form you want to change into. Maybe you could tie in the Knowledge (nature) thing here, by saying that you can only be "familiar" with one creature per skill rank.
Screw it up, and you get stuck in some related (but inferior) form. So, if you were aiming for Stone Giant, "Off Target" might be Hill Giant, "Similar Area" might be Ogre, and "Mishap" might be Giant Slug. Anything other than the target form means you can't voluntarily end the spell.
If you were trying to make the target weaker (Polymorph Other), it reverses, so if you were trying to make him a mouse, a Mishap might give a Fiendish Dire Weasel or something.

Then, add two new spells at level 6: "Polymorph Self Without Error" and "Polymorph Other Without Error"
 

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