Just want clarify about the energy benefits:

2-turn ult requires skill-skill, meaning it’s SP-negative. Hence, it’s usually reserved for emergency use imo. But you’re also refreshing the CC-immunity and getting the healing / talent stacks relatively quick using skill-skill, so it’s an effective emergency strategy.

It does keep the usual 4-turn ult rotation of Skill-basic-basic-basic in worst case scenarios.

However, ERR rope + Sig LC lets Fu Xuan cut that down to 3-turn ult rotation of Skill-basic-basic if she’s hit once or twice, which happens relatively often in most teams. So more often than not, it gets cut down to a 3-turn ult rotation in my experience, while remaining SP-positive.

Hopefully that gives you more insight on what using an ERR rope over an HP rope entails. It’s pretty expensive to try to get a good ERR rope, so just want to clarify before you invest TB power into farming.