A couple of reasons why you got killed by one and are now coming to the forums to complain about them:
1. You are bad at the game and don't want to form a way to counter them.
2. The warlock who killed you plays their class very well.
3. Coming to the forums to cry for nerfs just proves that you are bad.
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I have only been killed by Stormtrance warlocks proving that all warlocks who use storm caller have no skill