From Dragon Magazine 379: “You can gain and use only the skill powers associated with your trained skills. Whenever you reach a level that grants you a utility power from your class, you can choose a skill power in place of a class power. The skill power you choose must be of the same level as or lower than the class power you would have gained.”
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This could allow someone to take the level 2, 6, and 10 Heal Utility powers and contribute beyond others to the in-combat healing of the group, furthering the ability of a group of Athasian characters that does not comprise any of the current healers in its ranks to succeed a little better than before.