The Shield Update should have been released somewhere in May 2015, which might be the update before the Demolisher update, update 8. However it's unsure. Together with this update, or in an update between this and the Demolsiher update there came new weapons like Spark Frenzy, the De-Brainer, the Vampire's Bite and the Cobra Strike.

the De-Brainer was already in-game; confirmed in this video:

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