Spawning Power

The Spawning Power attribute reflects a Ritualist's skill when summoning or animating creatures. This is a primary attribute and may not be used by secondary ritualists.

Guild Wars description

 * For each rank of Spawning Power you have, creatures you create (or animate) will have 4% more Health, and weapon Spells you cast last 2% longer [sic]. Some Ritualist skills, especially those related to Spirit creatures, become more effective with higher Spawning Power.

General description
Spawning Powers will affect Ritualist and Ranger spirits, as well as Necromancer minions.

Creatures Health Bonus:

Associated skills
Spawning Power will enhance these listed spawning power skills. Many Spawning Power skills relate to Energy management, Weapon Spells, Rituals, spirits and animated / created / summoned creatures in general.