Played some more. Defeated the Hag. pretty tough coz The Hag on new hardest difficulty has
Legendary Action: Weird Magic Surge :
Once per round, she can spend a Legendary Action to summon more illusory duplicates and shuffle herself among them after a spell is cast.
A higher level spell will result in more illusory duplicates being summoned.
Legendary Actions restore at the start of each round.