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Silas Kipley: "Beer?"
Agent Walter Hahn: "No, thank you."
Silas Kipley: "What about whiskey? No? How 'bout some poly-sue or ace?"
— Silas Kipley offers Agent Hahn a number of substances upon the latter's visit to his home.

"Ace" is a slang term for a potent antianxiety agent. It is used predominantly on the human Outer Colony of Sedra, though the term has widespread usage throughout human-occupied space and can refer to a number of different drugs.[1][2][3] "Ace" is commonly combined with polypseudomorphine for recreational usage.[4]

List of appearances[edit]


  1. ^ Twitter, Kelly Gay (@KellyHGay): "No, since it's a prescription drug I envisioned it as more like a heavy anti-anxiety drug" (Retrieved on Oct 9, 2022) [archive]
  2. ^ Twitter, Kelly Gay (@KellyHGay): "no I thought of it as more a Sedran drug, however that name could be used to designate..." (Retrieved on Oct 9, 2022) [archive]
  3. ^ Twitter, Kelly Gay (@KellyHGay): "...other drugs in other parts of the universe. The poly-sue is used widely (also by UNSC)" (Retrieved on Oct 9, 2022) [archive]
  4. ^ Halo: Smoke and Shadow, chapter 12