I may be mistaken, but I believe that the description (and I’m assuming effect) of both the Major and Superior Sigil of Energy are bugged as they seem to be identical.
The text on the Superior Sigil reads: “Gain 50% of your endurance when you swap to this weapon while in combat. (Cooldown 9 seconds)”.
The text on the Major Sigil reads: “Gain 50% of your endurance when you swap to this weapon while in combat. (Cooldown 9 seconds)”.
I thought the effect on the Superior Sigil of Energy was supposed to be 100%. Even if not, I’m certain they’re not supposed to do the exact same thing (or at least have a description that says so).