Turning into a Deamon

[CarioMT]

Im the DM/GM of a DND game and one of my players finds a magic ring that boosts Int,Dex,Cha as well as other awesome effects. But the ring is cursed so that as long the player wears the ring, it slowly transforms them in to a something else
The thing is i cant think of what that something else should be. Im thing a succubus because the player is and attractive tiefling wizard.
Also i cant think of how that would happen. Any suggestions?

[Tacticslion]

Try mining the becoming a demon section!

[My Self]

Have it work opposite their alignment, kinda like a slow-action Helm of Opposite Alignment. Toss in some will or fort saves to resist being transformed whenever they fall unconscious, sleep, or fail a will or fort save. These should be at DC 10+3/4 level (equivalent to DC 10+max spell level+lowest ability modifier for spell level). Then toss in scaling penalties/bonuses (+1 to a save, or to a skill check, or an ability score, or a free SLA, etc.) and changes which are possessed by the creature the player's character is turning into.. Every 5 to 10 saves, have them make a will save against changing alignment 1 step towards your target alignment.

[Ciaran Barnes]

Don't force a save. Have the ring communicate its willingness to help the PC and some of its own desires as well. The GM gets to role play a voice in the PC's head. I was quite surprised when I did this and a PC began to change his behavior. I don't know that he turned full-on chaotic evil - because there were few "incidences" - but he ended up capital-C chaotic for sure.

[CarioMT]

So they turn evil now what? I want to take it a step further where they turn into a demon or zombie or something. Im still thinking a succubus but does anyone know a template i could add to the play if they become a succubus?

[Tacticslion]

CarioMT wrote:

So they turn evil now what? I want to take it a step further where they turn into a demon or zombie or something. Im still thinking a succubus but does anyone know a template i could add to the play if they become a succubus?

I'm not entirely sure what you mean. The love no I made earlier (click on the blue text) takes you to the rules that you need for transforming a PC into a demon. A half-succubus is known as an Alu-fiend and has a unique template (also found on the site I linked).

For a monster that becomes a PC classed creature, it stays the same, but gets modified ability scores (See "Advanceing Monsfers" for details, under the Bestiary section).

Im less link-happy right now because I'm on my phone. (Also I'm more prone to typos.)

[My Self]

They don't need to turn evil. You could make them turn LG and an angel, for kicks.

For succubus, just use the half-fiend template, then give them the succubus energy drain ability, the profane gift ability, and the alter self ability after they perform especially evil acts.

Replace the half-fiend spells at each level with succubus spells of the appropriate level.