Frost Bolt is full of bugs. The charged Frost Bolt applies slow to enemies around the target. The upgrades "Ice Wielder" applies even without taking the upgrade. Upgrade "Jagged Ice" is only suppose to apply on frozen enemies but applies to bosses as well, which I am not sure if its intended.
+1 to your suggestion of moving default freeze to upgrade "Arctic shatter" and turning it into a plain damage skill without affecting the dot.
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