Gjallar Horn is a Sparrow Mod in Destiny 2.
What it does
Honk! Press [###DestinyNamedSubstitutions.ui_player_action_vehicle_honk_button###] to honk your vehicle's equipped horn.
More Sparrow Mods
Aquarian HornSparrow Mod
Bellow HornSparrow Mod
Campfire HornSparrow Mod
Clarion HornSparrow Mod
Clown HornSparrow Mod
Dawning DareSparrow Mod
DestabilizersSparrow Mod
Duck HornSparrow Mod
Electric HornSparrow Mod
Fog HornSparrow Mod
Frame HornSparrow Mod
Happy DawningSparrow Mod
King's HornSparrow Mod
Noisy HornSparrow Mod
Vernier ThrustersSparrow Mod