Hmm, you may be right about diminishing utility. I am up to level 9 now and Evil Shoal, although still pretty useful, is no longer as outstanding as it used to be. Still, it is nice to have.
I like the upgrades that reduce rage costs or rest periods. After unlocking all 4 spirits, however, I suspect these upgrades will not be as useful as now, but they still might come in handy.
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