Iallanis is the Power of love, forgiveness, mercy, and beauty who turns away no giant who is of good nature or who has repented their evil. She despises no part of her father's creation and ever seeks to re-unite the giants in harmony. She is said to have a close friendship with Fionnghuala the swanmay Power, although why this is so is unknown. Among giant races, she has worshipers among cloud and storm giants, small groups of fir-bolg, and a scattering of voadkyn, but she is accepted among stone giants for her fairness of face and kindness of being.

Iallanis will accept any good-aligned true giant as a cleric on equal terms. Her clerics must strive to bring giantkind into the fold of good, to show mercy to all, and to cooperate with all other good creatures. They must create things of beauty-arts, crafts, gardens, etc. Clerics must be happily married in order to attain 3rd or higher level.