Enigma in Flames

Cultus corvus semper vigilantes
 Seth was yearning
 For explaining this macabre sight
 Unknown substances boiling
 And other gear that shone with spite
 For cues he started scouring
 And noticed a sign
 A seal on bloodstained letter
 Damned thorny "R"
 The envelope he opened
 And read the message out
 To ball in House of Orchids
 He now possessed an invite
 "Come to the ball, Sir Warren
 And wear a blood-red mask
 When clock strikes twelve, you'll find him...
 In shades of midnight's dreary dusk"
 All of a sudden, the cultist, still alive
 To destroy all evidence a simple plan contrived
 He reached out to the tablecloth dragging it down
 To make a lantern slip from desk and burn house to the ground
 As the famished flames rose higher
 Seth grabbed cultist's books and ran out
 As first rays graced town still sleeping
 Silence burst with anguished shrilling