Thanks tai, good catch on the charges. Only one charge can be active at a time, but switching (Fire Charge to Ice Charge) only changed the element. The old charge's icon stayed, and so did its Weapon Attack bonus, so two charges' bonuses stacked. Now a new charge ends the old one completely: its icon and its bonus go. To re-test: cast Fire Charge, then Ice Charge. Only Ice Charge's icon should be left. On your other two questions: Charged Blow hits at most 6 monsters, which matches the original skill data (I tested it against 10 monsters standing together). Charged Blow keeping the charge is intended: it's an owner balance change from 10-29, so the charge is not used up by Charged Blow or Blast.