To echo
KingGarland:
Branching Fates (Psychic): Once per turn, when you use a Fate dice to substitute a roll made for a model or unit within 12" of a Farseer model from your army, one model from your army with this ability can use it. If it does, the result of that Fate dice is first changed to a 6.
This ability can only be used once per turn regardless of how many models with the rule are in your army.
Fortune (Psychic): In your Command phase, you can roll one D6: on a 2+, select one friendly Aeldari unit within 12" of this Psyker. Until the start of your next Command phase, each time an attack targets that unit, subtract 1 from the Wound roll.
This ability an be used for each model with the rule as each
Psycher can roll and assign the effect.