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We received a few requests to delay the implementation of the Savage mode; however, we chose to release them at the same time. Even if you haven't completed the main scenario, you’ll only need to have completed the normal version of Omega: Deltascape to later challenge Sigmascape (Savage). Deltascape (Savage) completion is not a requirement.

If we were to release the Savage mode two weeks later, everyone’s item level will be increased during that time. Balancing was done based on release at Patch 4.2 timing, so we would have to re-adjust the overall balancing if we pushed back the release timing on the Savage mode. Also, doing this will make it more difficult to retain the value of the new crafted battle gear with higher item level unless we make it stronger.

For those looking to defeat it quickly. we would like players to use the new crafted battle gear. We believe the difficulty of the Savage mode is harder than Alte Roite from Deltascape. For those that consider the Savage mode as their main end game content, we believe that they feel it’s good to have the Savage mode released with the patch. We would like to continue to hear players feedback regarding this.

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I think it is good that they get released the same time, too.
I still would like an option to only play a (story)- savage mode, without having to play normal story mode.

As he mentioned that the dev team seems to be still thinking about it...and wants feedback, bumping this thread.