A 7th level chaotic good cleric of Gorum selected variant channeling for the Battle aspect of Gorum's portfolio during character creation. Since he is good he is channeling positive energy and during an encounter he used it to harm undead creatures. What happens?
Variant channeling:
A variant channeling either modifies positive channeled energy when used to heal or modifies negative energy when used to harm. When using positive energy to heal, affected creatures gain only half the normal amount of healing but also receive a specific beneficial effect. When channeling negative energy to harm, affected creatures take only half the normal damage but take an additional penalty or harmful effect; a successful saving throw negates the additional penalty or effect but does not reduce the damage any further. Creatures that would normally ignore the effect of a particular channel (such as undead with respect to a positive energy channel used to heal) ignore the variant effect.
Battle/Wrath:
Heal—Creatures gain a channel bonus on weapon damage and critical hit confirmation rolls until the end of your next turn. Harm—Creatures take a channel penalty on weapon damage and critical hit confirmation rolls until the end of your next turn.
Is positive energy that is used to harm simply not covered, i.e. he would do 4d6 damage (Will for half)? Or, is the positive energy to heal comment fluff and he deals [4d6]/2 damage and the undead take a -2 penalty on weapon damage and crit confirmation (Will negates the penalty)?
Thanks for any insights!