Fortitude
Adds +1 to Constitution (thus, depending on prior Constitution score, either 0/+1 to Fortitude saving throws and either 0/+1 to max HP per character level) and -1 to AC
Adds +2 to Constitution (thus adding +1 to Fortitude saving throws and +1 to max HP per character level) and –1 to AC
Adds +2 to all saving throws and reduces Darkrift damage inflicted upon the character by 10.
The effect of this Ioun Stone stacks with that of the Ioun Stone Topaz Sphere, but no character may equip more than one Ioun Stone with the word “Trilliant” in its name.
Adds +5 to maximum HP. In addition, the wearer may select one of the following bonuses at the start of the adventure: