We know that Arlecchino beat Traveler, Freminet, Lyney AND Lynette without even really trying (though she was in her second form?) however Ei also beat The traveler, even FASTER than Arlecchino did. Combining Ei and Raiden in this argument, Arlecchino and Raiden seem like they’re on the same level. We already know that the top 3 harbingers have power that rivals the archons, and Arlecchino is the 4th. She’s ALMOST there. We watched Capitano flee from Mauvika. (From what I saw.. I haven’t done the quest..) We also watched Signora die to Raiden very quickly. Signora was the 8th, so she’s half of Arlecchino’s power at best. Scaramouche was the 6th, and with the gnosis, he still lost to Nahida and the traveler, though the Traveler had all of Sumeru’s wisdom and infinite tries(?). We haven’t really seen Arlecchino or Ei fight any worthy opponents, since Arlecchino decided to negotiate with Neuvillette instead of fight him, and her fight with traveler and her kids couldn’t even be considered a fight, that was a damn massacre. You could argue that her fight against her mother was a real fight, but that was years ago, so her power levels have only grown. Ei was always way out of the Travelers league. So.. I’d personally put my bets on Ei, since she has more experience, she fought HERSELF FOR CENTURIES, and is a GOD that’s killed another harbinger, but my bias says Arlecchino. To argue for her, I’d say that since she beat her mother so easily, let’s say she was 17 then. Her powers have grown exponentially from what we’ve seen.. so maybe she could beat Ei if she was truly motivated, since she only beat her mother by using her determination and her thoughts of Clervie.