Avoid the Summoner’s spotlight when possible, or use a Shadowmane’s invisibility to disengage while watching for attacks that reveal you. If combat is unavoidable, bring durable armor, spare gear, and strong ranged weapons; keep moving, focus on its summoned creatures when necessary, and attack during the brief openings when its shield drops. Be especially cautious around mutagen, as collecting it can trigger additional Summoners and waves of enemies.