Heal

From DDO wiki

[edit] Heal (Wis)

The Heal skill is both an Active and passive skill.

[edit] Active

The Heal skill is actively used to save incapacitated players. This skill uses 1 healer's kit per attempt. The incapacitated player can be revived but they will only be healed to 1 hit point if a successful Heal check is made. To make a successful Heal check, your Heal skill + 1d20 must equal or exceed the DC check for reviving an incapacitated player. The DC of the Heal check to revive a wounded player is 20.

[edit] Passive

The Heal skill is passively used to determine the number of hit points that are regained at rest shrines. The number of hit points regained at a shrine is determined by the highest Heal skill of any nearby ally (thus, it is helpful for Clerics or other high-Wisdom characters to stand in rest shrines when someone else is using them).

The exact formula is: 10 + 3 * (level + maximum score in Heal of a nearby party member). Note that this does not apply to warforged, who rely on the repair skill.