Tip: Don't bother using Meteor on the last bosses. Not only is it expensive, but with their large health pools they can easily take a few. Terror is much, much better on them. It is cheaper, it takes the backwards so they spend more time being hit by your tower, and most importantly of all with the drain life spell they lose 5% of their max health every second. So even bosses with huge health pools life the queen or the pirate ship will die after just 20 secs in fear.
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