isn't there already:
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a thread (about transformation in dragon)... Found it!
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a guideline? ok no. But read "Creo animal" box, it says something interesting. Basically, and that's also covered in the other thread: Vim requisite mandatory; [power(s)] requisite(s), [form] requisite. Might cannot exceed level of spell.
So, if i consolidate those datas, IMO, for a muto spell:
base = base of the "mundane" equivalent transformation
- parameters
- X for X of might
- free requisite of Vim, form and power(s)
- size of transformation
Example, to turn into Stellatus (ArM5 p 194), size +8, might 50, animal shape, ignem nature, and Mentem, Ignem powers.
Base 10 (animal land) +3 magnitude for size +8. Might 50 => +50 levels
Personal +0
Duration (year) +4
Target : individual +0
Final spell: "I'm your father. Or not. But be scared."
MuCo(An,Ig,Me,Vi) 95 ritual
(base 10, pers, year, individual, +3 size for the aimed form, +0 free requisite animal, ignem, mentem, vim)
You turn into Stellatus.
You are affected by animal (your shape current body), mentem (your essential nature and also shape current mind), corpus (essential nature), ignem (your current form nature) and vim (your shape magical nature). If your shape might is destroyed, you suffer the same consequences that would a normal might being when might is 0, according your saga rules (that can be dead, or just becoming mundane).