I tested this yesterday, i spent one skilll point on crystal shard and after using it for a few minutes it went from 1 to 4.
The skill that is taking forever to level up from 1-4 is Blessing of Protection (Restoration staff). I spammed it on so many low health players during dark anchors and world bosses, it sits now on 3 after hours and hours.
Also the Overload ultimate sometimes never got charged, despite spamming storm calling abilities.
Now, sometimes when I exit the game and wait a few seconds before relaunching it, the ultimate ability would recharge normally.
Did anyone experience this? some skills from 1-4 take forever to level up and some are in a blink of an eye?
mDKs still need a lot of love!