Earth scroll definitely overshadows whirlwind. And upgrades in a Zelda like are fine. I do have some ideas to make whirlwind better instead of invincibility. It could do:
- Damage over time to enemies in it’s radius.
- Stun enemies that get hit by it for half a second that are not bosses. (0 movement in place so they keep taking the damage over time.)
This could make it more unique than the earth scroll.
The thing is I love to use charge abilities in the game. I feel like I got rewarded for something I prepared for. That is why I kept thinking about why I wasn’t using whirlwind enough.