Try using this coding, I don't have COP so I can't test it.
I can break it down a bit for you and others to use more standard coding effects.Code:Twilight Sanctuary; (C); AURA: 30 color[cyan], !foe; Twilight Sanctuary AoE; TREGENE: 1d6+8
; Breaks up coding functions
First part is the name, "Twilight Sancturary"
Second part is effects clauses that might have to do with the effect itself. In this case it's "(C)" for concentration.
Third part is the coding which is "AURA: 30 color[cyan], !foe" which is going to apply an effect.
Fourth Part is the name of effect that is applied from the AURA which you want to name so you know where it's coming from, "Twilight Sancturary AoE"
Fifth part is the applied effect from the AURA coding "TREGENE: 1d6+8"

