I dont think maxing "High Explosive" would increase your vigor use. Increase cost of vigor/morale/mana, should be determiend by the skill/spell rank, higher rank will cost more and require more cool-down.
Cleave on War battle tree on the other hand, is another story. I added 1 point into it so i can hit 2 targets, so it says morale cost will be 100% increase. I take it that if the regular Swift Strike Rank1 cost 15, it will become 30; if Rank5 is 50, it becomes 100
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