I have noticed while playing with ardan and phin that Slumbering husk acts a bit differently with their abilities while its active. Like if your husk just triggered and you try to vanguard someone your vangaurd will give team mates be 3 times more barrier. And same with phine's polite company. What i think is it can be used in team fights to turn the tide completely with ardan and phin. I have used it one or twice though timing is really crucial. And u can grt through whole joules ult...