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also clickstorm ability helps with that

It should be noted, that as said by psycholoser, "Clickstorm" is a skill from the hero "Cid, the Helpful Adventurer" as his second upgrade. You can buy it when you level him up to 25 and it costs 250 gold. After purchasing it, check to the right of his image and you should see a vertical grey bar with boxes that have locks inside of them. (between the enemy and your heroes list) At the very top you will see what looks like a golden hand with its pointer finger pointing to the top right of your screen. Click this skill and then also click the enemy yourself to get this faster.