You suffer erratic changes in behaviour, as though there are two personalities in control of your body. You act perfectly fine in both cases, without any obvious negative effects, but occasionally flip between your main self, and the lurking other.
Perhaps encountering your warlock patron unhinged you, the infinite extent of an alien presence harder to handle than your fragile mortal self expected.
Perhaps you were an ancient warforged, damaged in battle, the effects of such have given rise to “a bit of a wire loose”.
Or Perhaps you were subject of an unfortunate magical accident, a crown of madness spell gone haywire.
Your host of personalities bubble to the surface to take control of your person, occasionally swapping which is piloting your mind. Each of your personalities have a different alignment, which can influence how you behave.
Sanity save: the number of personalities a character has (maximum of 9)
Every long or short rest, initiative roll, or combat exit, you must succeed on a sanity saving throw.
On a success, you suffer no effects. On a fail, you change your personality to the rolled number.
For example, a character has a chaotic good, and a lawful good personality. After a short rest, they roll a d10 sanity check, on an odd number the personality stays the same, on an even number the personality switches
Additional: Characters affected by crown of madness or other similar afflictions automatically fail the sanity check.
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