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The self buff increases your armor and it should show this in the stat window.

The most important reason to put some points into dex was getting more hit, but with the latest update that seems to be really easy now because items have tons of +hit% on them.

I'm not sure but I don't think it is a full respec, just a stat reset. Resetting my stats showed a cost of 0 plat.

Good to see that you are moving away from auto attacks and put more emphasis on abilities. Might want to do something about the low regen rates though.
For those complaining about the armor nerfs,...