From LSWiki

Renew is the ability to burn your injuries away with fire. This is a strong personal heal effect, but if activated in combat, it is also a powerful area attack that deals fire damage. It costs 50 points of elemental fire resource energy, fueled by the Convert charm; this translates to around 250-300 spell points, with adequate skills. The damage only hits enemies that you are fighting with, and does not hit your familiar or other followers.

Important note: you must be damaged to activate this charm.

Your familiar must be alive and present in your environment for this charm to work.

Usage

concentrate on renewing myself