Alternate Corrupted Template
This is a cool idea you came up with for making alternate witch types. Here is my take on the Corrupted to make it a bit more flexible. Not all those who make an infernal pact want the same thing, after all...
Corrupted Template (Alternate)
To qualify, a humanoid must make a pact with Evil outsider. In exchange for the humanoid’s service (generally for life) and/or soul, the fiend grants the humanoid great powers to help in commiting evil acts. So long as the humanoid does not break the pact, they receive all the benefits of this template; should they break the pact, all template benefits are immediately lost until the humanoid appeases the fiend (if possible). Note that the corrupted radiates evil under a detect evil spell as an evil creature of its character level or full HD.
AC: +1 natural armor
Abilities: +2 to any three ability scores of corrupted’s choice
Feats: Choose any two from the following list of thirteen: Ability focus (+2 DC to one spell-like ability), alertness, attractive appearance (+2 to bluff and diplomacy checks vs those of similar race and an additional +2 vs those of similar race who
are attracted to your gender), blooded (FR), cosmopolitan (FR), extra spell (grants one additional use per day of one spell-like ability), silver tongue (+2 bluff and diplomacy), improved initiative, scent (MM), spell focus, skill focus, thug (FR), toughness.
SA: spell choice -see below
SQ: Poison Immunity, Fear Immunity, Darkvision (60 ft.) or original vision +30 ft.
CR: +2 (+1 if encountered without its special magic item)
Other: The fiend who makes a deal with the corrupted often gives a magic item as a "gift" to it. The magic item should be worth no more than the character's level X 2,000 gp. The item will always appear to be extremely valuable and of exquisite craftmanship but is subtly (or obviously) evil (and radiates as evil if detected for, of a level equal to the HD of the fiend who bestowed it). The item is supernaturally attuned to the corrupted and will function only for it or for the fiend who bestowed
the item. The item cannot be used to attack the fiend who bestowed it or else it is automatically destroyed.
A typical item (or matched set) bestowed on a 1st level corrupted might be any of the following:
a set of +1 armor and +1 shield,
a +1 weapon,
a +1 ring of protection,
a ring of skill (+10 competence bonus to one skill appropriate to the corrupted---inspired by ring of climbing in DMG),
a set of +1 bracers of armor and +1 cloak of resistance,
a hat of disguise,
a heart of the beast (MoF),
a heward’s handy haversack,
a horn of fog,
a pair of slippers of spider climbing,
a vest of escape.
Spells:
The corrupted creature can choose one of the following spells to be cast once per day as a sorcerer of the character's level:
bane,
burning hands,
cause fear,
change self,
charm kiss (as charm person but DC +2 and can only be used against those of opposite sex and similar race; caster must touch his lips to exposed flesh of subject. Somatic component only),
charm person,
chill touch,
color spray (appears as black mist with grinning white skulls),
corrosive grasp (MoF),
detect gold (RR),
detect magic,
disappear (RR),
doom,
endure elements,
faith healing (MoF),
flame bolt (RR),
forcewave (MoF),
horizakaul’s boom (MoF),
identify,
inflict light wounds,
kauper’s skittish nerves (MoF),
magic missile,
magic weapon,
obscuring mist,
protection from chaos (granted by lawful fiends only),
protection from good,
protection from law (granted by chaotic fiends only),
ray of enfeeblement,
shield,
shield of faith,
shocking grasp,
sleep,
speed swim (MoF),
spider climb,
summon monster I (evil creatures only),
summon undead I (MoF),
true strike,
wieldskill (MoF).
The corrupted character gets to choose a second spell at 5th level, a third spell at 10th level, a fourth spell at 15th level, and a fifth spell at 20th level. Alternately, the corrupted character may opt to receive one additional use per day of a preexisting spell in place of learning a new one.
*** Opinions welcome!
Edit: Added CR notation regarding encountering a Corrupted without their special magic item.