Ple-Sen
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I'm leveling up Endurance, unless Ples interferes again.
Well, yes, Endurance would be very useful for Erihu, so he can reach 100% resurrection. Freshness and Freedom are also good. Among the alternatives for you, there's only Haven with Freshness, but it's unreliable and aimed at the distant future, and for Pontus, power is a bit low.
Added 1 minute ago
However, before leaving the city, Erich still went to the Colossus and did some running on the treadmill. He may have even watched some of his teammates run on it beforehand.