Hush Slush is an elixir mentioned in the Barnes and Noble, Nightfall: Special Edition Keefe Short Story in Keefe's perspective. Its effects wipe out the victims' voice for eight hours (possibly more if quantity has an effect), as shown by Keefe reflecting on the glorious eight hours without Ro's voice. In reaction to this, the princess located all of Keefe's stashes of pranking supplies, and possibly slipped Gurgle Gut in his breakfast for payback. This elixir works both on ogres and elves. It is presumably sold at Slurps and Burps.