You've been traveling across the world with your adventuring party when you came across a magical forest that was maintained by Mother Nature herself who demanded that your party deal with monsters threatening her forest. You managed to defeat them and came back to Mother Nature, satisfied with the results she said enthusiastically

"Thank you brave adventurers. Usually, humans, elves, and other races don't come near my land so I am rejoiced that someone was generous enough to help. You all have my blessing and are free to go" She says with a soft smile. As your party waves goodbye and are about to leave, vegetal tendrils sprout out of the ground and wrap around you, rendering you uncapable of moving.

"However you will be staying here." Mother Nature says with a smile, not explaining why, your party just left knowing there is no defeating her.