Clair Obscur's final boss was a bit easier than developer Sandfall planned, mostly because everyone actually engaged with all the side content

Clair Obscur: Expedition 33 developer Sandfall underestimated just how much players would engage with the game's various sidequests and optional content, and as a result of this extra grinding would find the final boss fight a tad underwhelming.

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source https://www.eurogamer.net/clair-obscurs-final-boss-was-a-bit-easier-than-developer-sandfall-planned-mostly-because-everyone-actually-engaged-with-all-the-side-content