Ok, this is the broad description...<br/><br/>"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."<br/><br/><br/>There is a further descriptor that may be what you're looking at...<br/><br/>"Enhanced Effects Some variant channeling abilities are enhanced when used on particular creature types. Such channeling increases the normal healing or damage from channeled energy by 50% for that creature type, rather than the default half healing or damage for the alternative channeling."<br/><br/>Essencially, you want to make dwarves the creature type and get an increased power level for the ability? Using the energy on anything else would not get the bonus, true, and I would accept this option.