From Pathfinder #209: Destroyer's Doom, which isn't enabled.

Entreat Thunderbird

RITUAL 5

RARE

Cast 1 hour

Cost rare incense and offerings worth 300 gp

Secondary Casters 3

Primary Check DC 29 Nature or Religion

Secondary Checks Diplomacy, Mountain Lore, Nature, or Survival

Duration 1 month

You entreat the thunderbird in the Tusk Mountains to come to your aid. While performing this ritual, the secondary casters can appeal to the thunderbird's pride or tempestuous nature to gain a +2 circumstance bonus to their checks.

Critical Success The thunderbird is helpful to the casters for the duration.

Success The thunderbird is friendly to the casters for the duration.

Failure The thunderbird ignores the entreaty and remains indifferent.

Critical Failure The thunderbird takes offense and permanently departs the area.

Pathfinder #209: Destroyer's DoomORC