A turbine assembly for a gas turbine engine, the turbine assembly comprising: a first turbine blade circumferentially adjacent to a second turbine blade, said first turbine blade including a first platform with a first underplatform surface, said second turbine blade including a second platform with a second underplatform surface, and said first underplatform surface and said second underplatform surface at least partially defining a cavity; and a damper seal assembly comprising: a seal, wherein said seal includes a first strap that extends generally flush with a top surface of said seal; and a damper, wherein said damper interfaces with said first underplatform surface and said second underplatform surface; characterised in that: said seal and said damper are collectively manufactured as an inseparable assembly by an additive manufacturing process, said additively manufactured seal further comprising a second strap and a third strap generally parallel to said first strap and displaced therefrom to form a damper retention area generally therebetween for entrapment of said additively manufactured damper, said additively manufactured damper includes a platform rub surface with a groove formed therein opposite an undersurface of a main body, said groove at least partially receives said first strap, and said damper further comprises a first wing and a second wing that extend from said main body generally parallel to said groove and are of a length greater than that of said damper retention area. a first turbine blade circumferentially adjacent to a second turbine blade, said first turbine blade including a first platform with a first underplatform surface, said second turbine blade including a second platform with a second underplatform surface, and said first underplatform surface and said second underplatform surface at least partially defining a cavity; and a damper seal assembly comprising: a seal, wherein said seal includes a first strap that extends generally flush with a top surface of said seal; and a damper, wherein said damper interfaces with said first underplatform surface and said second underplatform surface; a seal, wherein said seal includes a first strap that extends generally flush with a top surface of said seal; and a damper, wherein said damper interfaces with said first underplatform surface and said second underplatform surface; characterised in that: said seal and said damper are collectively manufactured as an inseparable assembly by an additive manufacturing process, said additively manufactured seal further comprising a second strap and a third strap generally parallel to said first strap and displaced therefrom to form a damper retention area generally therebetween for entrapment of said additively manufactured damper, said additively manufactured damper includes a platform rub surface with a groove formed therein opposite an undersurface of a main body, said groove at least partially receives said first strap, and said damper further comprises a first wing and a second wing that extend from said main body generally parallel to said groove and are of a length greater than that of said damper retention area. said seal and said damper are collectively manufactured as an inseparable assembly by an additive manufacturing process, said additively manufactured seal further comprising a second strap and a third strap generally parallel to said first strap and displaced therefrom to form a damper retention area generally therebetween for entrapment of said additively manufactured damper, said additively manufactured damper includes a platform rub surface with a groove formed therein opposite an undersurface of a main body, said groove at least partially receives said first strap, and said damper further comprises a first wing and a second wing that extend from said main body generally parallel to said groove and are of a length greater than that of said damper retention area.