Ironhand Grenadier is a summonable ally during
Confront the Elder Brain if the party completes
Avenge the Ironhands.
Ironhand Grenadiers can be summoned with the
Gather Your Allies variant,
Ironhand Grenadiers, if the completing
Avenge the Ironhands by either siding with
Wulbren or by persuading
Barcus Wroot to take over leadership of the Ironhands.