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A warmup (sometimes called a "cool-up" or "coolup") is basically a wait time before an ability (skill, spell, or talent) can be used initially. It is not a formal term that Blizzard uses, but Cory Stockton has used the term "cool-up" and they have implemented mechanics that follow this behavior.
- appears to have around a 0.5 sec warmup after entering combat.
- ω ϖ will probably have a 3 min warmup.