As Terran
Make:
Ghost
Marauder
Siege TankEMP removes most of the Archon value before the fight begins.
Open in the counter tool with Archon tagged ->As Protoss
Make:
Immortal
Disruptor
TempestImmortals and burst damage trade up into Archons.
Open in the counter tool with Archon tagged ->As Zerg
Make:
Roach
Lurker
Brood LordKeep light units from being the main target.
Open in the counter tool with Archon tagged ->
Zealot
Adept
Stalker
Sentry
Observer
Warp Prism
Colossus
High Templar