Consistent luck.

Why is she considered an exotic choice? Anwen is a very strong hero. On a large map in a long game, when there is an opportunity to choose from a wide range of sworn enemies, and also to obtain the Amulet of Mastery, I would prefer her over Wing. I believe calculations were made and articles were written stating that with her ability, she will 100% inflict an additional 30-40% damage to sworn enemies, in addition to the regular damage (depending on the level). And if the Avenger skill also triggers and a critical double damage is dealt, then you can say that the enemy's stacks are practically gone. In this case, I would definitely invest in Education and Forest Lore for Anwen. Then the chance of a critical hit will be 60%, which is a lot, considering that even with a 40% probability, the skill often works. In this case, 3 key enemy stacks can be considered defeated.