Hmm, not sure when the Jack o' Lanterns started. But from what you say, these Mr. Frost dudes seem a lot harder to kill, despite dropping about the same type of rewards. I remember getting 3-4 cards and a pet from my Jack kills.
I was about level 37 when I saw my first level 40 Jack, and I could kill it pretty easily. Took a while, and a few HP stones; definitely harder than your regular monster, but still nothing to get too worried about.
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We rode on the winds of the rising storm
We ran to the sounds of thunder
We danced among the lightning bolts
And tore the world asunder
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