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Healing Power
It depends on the skill or trait that uses it. Skills/traits/effects that heal will use a certain percentage of your healing power stat when healing. Look up any individual healing skill/trait/effect on the wiki, and it will show you the formula used for it.
Here’s an example, using the regeneration boon: http://wiki.guildwars2.com/wiki/Regeneration
Hi mrauls,
Healing power is a statistic which increases the amount of hit points you receive for healing skills you yourself casts. Healing power scales linearly, which basically means the more healing power you have, the larger your heals are, and the more hit points you get back.
However, different healing skills have different coefficients which affect how much of your healing power you get to utilize. For instance, Signet of Resolve will utilize 125% of your healing power, whereas Altruistic Healing will only utilize 1%. In both cases, the more healing power you have, the greater your healing will be. However, the size of that increase is very different.
The way Guild Wars 2 is set up, there are no real “healing classes.” Guardian healing is really meant to be a “soft vitality” and “soft armor” system. We have the lowest base health pool in the game, but the greatest number of healing skills. This means we can use healing to supplement our lack of vitality and increase our ability to mitigate damage.
Soft vitality basically means that, if you have 14,000 hit points, but can heal 2,000 of those hit points, you essentially have 16,000 hit points – even though you don’t have more than 14,000. But because you can heal for at least 2,000, you have essentially the same survivability as someone with 16,000 hit points and no healing. This is how soft vitality works.
Soft armor comes from damage mitigation, through healing over time effects. Let’s say your armor is able to mitigate 25% of incoming damage. This means an enemy attack for 1,000 damage will hit you for 750 hit points. However, if you have 200 HP passive regen, that’s essentially an extra 20% mitigation to that 1,000 point attack, because it will now only inflict 550 damage.
Healing also brings group utility to a guardian, because others can benefit from his healing abilities, not just the player himself. The Guardian is one of the more group-oriented classes in the game, so he can hand out boons and healing to others with ease. This means that higher healing power not only benefits you, but those around you as well. Vitality is a selfish stat, whereas healing power is group-oriented stat.
I hope that cleared some things up for you. Good luck!