Para um lv17 Invocador de Espirito , essa habilidade não faz nada.
Spirit Summoner diz isso do Spirit que você recebeu:
A spirit summoner forms a mystical bond with one spirit from the shaman class. He gains the spirit ability of that spirit and uses his summoner level as his shaman level for determining its effects...
At 9th level, the summoner gains the abilities listed in the greater version of his selected spirit.
At 17th level, the summoner gains the abilities listed for the true version of his selected spirit.
O espírito da natureza concede o seguinte habilidades.
Storm Burst (Su): As a standard action, the shaman causes a small storm of swirling wind and rain to form around one creature within 30 feet. This storm causes the target to treat all foes as if they had concealment, suffering a 20% miss chance for 1 round plus 1 round for every 4 shaman levels she possesses. The shaman can use this ability a number of times per day equal to 3 + her Charisma modifier. At 11th level, any weapon she wields is treated as a thundering weapon.
Spirit of Nature (Su): Whenever the shaman is reduced to below 0 hit points, she automatically stabilizes and gains fast healing 1 for 1d4 rounds. At 15th level, this increases to fast healing 3.
Companion Animal (Su): The shaman’s spirit animal takes the form of an animal companion of her choice, using her shaman level as her effective druid level. [ ... more stuff about how this works... ]
Nada disso dá acesso ao Spirit Animal recurso de classe do Shaman , e como tal você não tem, a menos que você tenha várias classes em Xamã , um espírito animal para a sua habilidade de espírito natural de se transformar em um animal real.