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While playing an undead heavy module today with my Winter Witch, an interesting question arose: Can the Frozen Caress Hex be used to modify the Cure Light Wounds spell cast by Healing Hex, specifically to allow for the application of Ice Magic and/or Elemental Focus benefits? This issue arose in the case of utilizing the hex offensively against undead (See this FAQ entry for a ruling on doing so, which may also influence the answer to the question at hand.)
The question is important because Frozen Caress adds 1d4 Cold Damage (negated if the spell allows for a save for half/no damage) and adds the Cold descriptor. A Winter Witch's Ice Magic class feature adds +1 to the DC of spells that deal cold damage and/or have the Cold Descriptor; therefore it would modify the damage & save DC of the Cure Light Wounds via Healing Hex. The addition of Cold Damage/Descriptor also kicks in Elemental Focus (Cold).
For your reference...
Elemental Focus
Choose one energy type (acid, cold, electricity, or fire). Add +1 to the Difficulty Class for all saving throws against spells that deal damage of the energy type you select.
Frozen Caress:
Frozen Caress (Su) Whenever the winter witch casts a touch spell, she can infuse the magic with cold as a swift action. This grants the spell the cold descriptor, and adds 1d4 points of cold damage to the spell’s effect. If the touch spell allows a saving throw, a successful save negates this additional cold damage.
Ice Magic:
When a winter witch casts a spell with the cold descriptor, the save DC of the spell increases by +1. A winter witch cannot learn or cast spells with the fire descriptor at all.
Healing Hex:
Healing (Su): A witch can soothe the wounds of those she touches. This acts as a cure light wounds spell, using the witch’s caster level. Once a creature has benefited from the healing hex, it cannot benefit from it again for 24 hours. At 5th level, this hex acts like cure moderate wounds.
Spell-like Abilities:
Spell-Like Abilities (Sp)
Spell-like abilities function just like spells, but are granted through a special racial ability or by a specific class ability (as opposed to spells, which are gained by spellcasting classes as a character gains levels).
Healing Hex is not a spell like ability its a Su ability.
assuming you wanted to house rule it I don't see it as an unreasonable combination since you can only hit each creature once with it per day.
however going by raw you could not modify the Su ability in this way