Change heal to a targeted ally-only ability

Heal will then boost their speed and heal them. Give it a shorter cooldown since it's then a support-only spell. Then, to compensate for the lack of self-defense that the ability provides, combine the Barrier and Cleanse abilities and that way squishies have something to grab instead. Right now, Heal is primarily used for its self-speed boost and is rather selfish considering its potential as a support spell. Then combine Heal with Clarity to make it an even more interesting support tool.