>Jim or Sarah Davies, but probably Jim
Powergaming abuse? I'm not really seeing it likely to happen.
Limiting it to the list of races in REINCARNATE would be a given in my
campaign. If you want to be able to specify races NOT listed there,
that's an entirely new area of negotiating spell levels.
Then there's both level loss and LA to take into account. The
REINCARNATE spell causes you to lose a level (or hit die) just like
RAISE DEAD does, that's a big hit right there. In a campaign,
powergamers will not take things over by repeatedly losing a level.
On top of that, a bugbear is LA +1 (at least, it is in 3.5E). So
you've already lost a level, and then to actually get a level higher
than you started, you need the XP to not only replace the lost level
but also to compensate for the LA, and THEN enough XP to actually go
up a level. They'd have to be at a lower level for a LONG time - not
something most powergamers want to do.
I suppose if they present a character rebuilt in this manner to a new
DM, they might depend on the DM not doing a good audit of the
character. But that can happen with any "trade XP for some advantage"
situation. The DM has to audit characters for reasonableness. If the
powergamer's PC used to be a 12th level character and traded 5 levels
for various stat boosts via REINCARNATE and then claimed that his
character was suitable for a game with other 7th level characters, the
unreasonableness should be pretty obvious (not just in stats, but
because he would have the magic items of a 12th level PC). Or if he
added those 5 levels back in and tried to say the PC was suitable for
the 12th level game - the unreasonableness still ought to be apparent.
It should be about as obvious as someone just deciding on their own
"I'll add a +4 bonus to whatever I roll for every stat."
For myself, I wouldn't have a problem with a LIMITED WISH spell (cast
ahead of time) to allow the REINCARNATION to bring about a specific
result. The use of a single spell (WISH) to get the original body
type back involves ripping the soul out of the body it currently
inhabits as well as simulating the REINCARNATION spell itself - with
the additional new ability of specifying the result of the
REINCARNATION. It would seem easier to just put an already-separated
soul into a specific type of new body (one the REINCARNATE spell
already has the power to produce). So an additional 7th level arcane
spell on top of the 4th level divine spell is the way I'd judge the
game to be "already set up" to produce that particular result.
For someone to want to research an "IMPROVED REINCARNATION" druid
spell that does it all in one spell - I'd probably allow it as a
single 7th level druid spell. There's a lot of spell research to do,
and there's no mixing of arcane and divine disciplines so it's more
"efficient" than needing both a 4th level druid spell and a 7th level
wizard/sorcerer spell. (A LIMITED WISH can only simulate a 5th level
druid spell, so I'd actually consider the "base effect" already in the
game to be equivalent to a 4th level divine spell and a linked 5th
level divine spell.)
If someone wanted to research a 5th level spell "DIRECT A SEPARATE
REINCARNATION SPELL" I'd probably allow that too. Since "charging"
for any LA bumps prevents any super-optimizing plans, and since the
whole thing would be used rather sparingly (given reasonable play by
the players, the death rate is pretty low in my campaigns) I just
don't see it as being a problem.