Not sure if this is just the result of all custom spells being gone, but Druids can't cast Endurance anymore.
I don't recall druids being able to cast Endurance at any time, and I have played some on and off with the custom spells installed. Correct me if it was a very recent change.
At no point were druids able to cast Endurance. There was a custom change that added cat's grace to the selection however.