Nature ritual

Skill type. Nature Rituals are skills unique to the ranger profession. These skills summon a spirit that provides a global effect to all those in its area of effect. Unlike Binding Rituals, Nature Rituals affect everyone in their range, enemies and allies alike.

The Nature Ritual spirits resemble miniature druids from the Maguuma Jungle and Melandru's Watcher, the avatar of Melandru, the patron goddess of rangers.

Ebon Vanguard Ritual
At first glance they may look like a nature ritual, but their function is akin to those of binding rituals, even though they summon a spirit of nature.

Historical

 * Nature rituals did not always summon spirits. At the original release of Prophecies, a nature ritual approximated an environment effect that was cast by a player and lasted for the ritual's duration.
 * Only one nature ritual could be in effect at a time, with the most recently cast ritual replacing any earlier one. Furthermore, as there was no physical spirit to kill, nature rituals could not be ended prematurely except by casting another or by using a now-removed skill.
 * When nature rituals were changed to create physical spirits, there was initially no limit on the number of copies of a spirit that could be on the field.
 * At that time spirits also affected the physical forms of each other, and not just players.
 * A team build known as "spirit spam" based on these facts dominated Heroes' Ascent (at the time known as Tomb of the Primeval Kings), utilizing large numbers of spirits created by rangers using Oath Shot to both body block other teams and prevent them from being able to score kills, thus allowing them to hold the Hall of Heroes for lengthy amounts of time.
 * Both of these features were removed in the August 25th, 2005 update