Submitted for community feedback:

UPDATE: Polymorph effect fixed.

ALTER

Concentration: Yes

Skills: Arcana

This action represents the use of magic to change the physical form or appearance of an inanimate Silhouette 0 object within short range (for example, changing a sword into a stick). The default difficulty for the check is Easy (1P). If the check is successful, the change will continue until the end of the character’s next turn. Before making the check, choose any number of additional effects listed on the table below. These effects are added to the check.

I would like to take a second to note that "alter" is the german equivalent of "dude".

On topic, some things might need clarification:

Can Grand Polymorph be used to target yourself? As in, does this spell encompass a quasi shapeshift spell?

And, assuming the caster is silhouette 1, thus the size effect needs to be added once to target themself, does

16 minutes ago, tafattel said:

can be used to increase or decrease the size of the target by one Slhouette size

mean that they can turn themself into a silhouette 2 creature (and even bigger if size is added multiple times)?

For a transmutation/polymorph spell this looks very sound, but if meant to double as shapeshift, I think 5 purple (base + size + grand polymorph) is a lot to turn into a silhouette 2 creature.

11 minutes ago, Klort said:

Can Grand Polymorph be used to target yourself? As in, does this spell encompass a quasi shapeshift spell?

I would say so. I had in mind the AD&D Polymorph Any Object 8th-level spell when I thought about this one.

15 minutes ago, Klort said:

And, assuming the caster is silhouette 1, thus the size effect needs to be added once to target themself, does

mean that they can turn themself into a silhouette 2 creature (and even bigger if size is added multiple times)?

Yes.

18 minutes ago, Klort said:

For a transmutation/polymorph spell this looks very sound, but if meant to double as shapeshift, I think 5 purple (base + size + grand polymorph) is a lot to turn into a silhouette 2 creature.

I had not really intended it as a shapeshift spell (though of course I wouldn’t say it couldn’t be used that way), but as you say I was thinking more along the lines of transmutation/polymorph.

14 hours ago, Klort said:

I would like to take a second to note that "alter" is the german equivalent of "dude".

i would propose the names "Shape" or "Alterate

14 hours ago, Klort said:

5 purple (base + size + grand polymorph) is a lot to turn into a silhouette 2 creature.

i would add:

Enlarge/Shrink (Arcane, Primal or Self Only) [+1P]: As "Size", except it can be used to enlarge/shrink the Target by +1/-1 Silhouette regardless of the Targets starting Silhouette. Can only be used on single Targets.

I think base polymorph should be +2 instead of +1. 1 extra purple to completely turn off a creatures special abilities seems like a lot.

20 hours ago, Terefang said:

i would add:

Enlarge/Shrink (Arcane, Primal or Self Only) [+1P]: As "Size", except it can be used to enlarge/shrink the Target by +1/-1 Silhouette regardless of the Targets starting Silhouette. Can only be used on single Targets.

I like that. Might have to play with the base spell but that would work, and “Size” can be simplified.

16 hours ago, Noahjam325 said:

I think base polymorph should be +2 instead of +1. 1 extra purple to completely turn off a creatures special abilities seems like a lot.

Well I’m thinking that it’s not so much turning off special abilities but just being a simple shapeshift, sort of like putting on a costume. Thus Grand Polymorph will bestow the special abilities for 2 purple.

20 minutes ago, tafattel said:

I like that. Might have to play with the base spell but that would work, and “Size” can be simplified.

Well I’m thinking that it’s not so much turning off special abilities but just being a simple shapeshift, sort of like putting on a costume. Thus Grand Polymorph will bestow the special abilities for 2 purple.

Yes, well, you specifically call out turning off a creature’s special abilities in the Polymorph effect.

Quote

The  target will not gain any of its new form's special abilities, but will lose any it possessed before the transformation (a dog turned into a dragon will not have fiery breath or be able to use magic  , but a dragon turned into a dog will lose it's breath and magic). 

This is far too powerful for a spell at difficulty (base of , + for the Polymorph effect).

18 minutes ago, Simon Retold said:

Yes, well, you specifically call out turning off a creature’s special abilities in the Polymorph effect.

This is far too powerful for a spell at difficulty (base of , + for the Polymorph effect).

So I did, oops. I thought I had edited that but it appears not. Special abilities should not be turned off by Polymorph - that effect should not touch any special abilities. Thanks for pointing that out!