In order to use the console make sure to enable the game's debugmode. You can do this by setting the game's launch settings to -debug_mode or by enabling a mod called Advanced Cheat Menu which adds a button to enable debugmode through the game.

Here you'll find the console commands to spawn all available Valyrian Steel Swords. Make sure to input the commands below exactly as you read them to avoid errors or mistakes because some of them are different from the rest, such as Orphan-Maker's!

Blackfyre: effect agot_create_artifact_vs_blackfyre_effect = { OWNER = this }

Adder's Fang: effect agot_create_artifact_vs_adders_fang_effect = { OWNER = this }

Darktalon: effect agot_create_artifact_vs_darktalon_effect = { OWNER = this }

Dawn: effect agot_create_artifact_vs_dawn_effect = { OWNER = this }
(Keep in mind only a character nicknamed as Sword of the Morning can equip Dawn)

Defiance: effect agot_create_artifact_vs_defiance_effect = { OWNER = this }

Disputant: effect agot_create_artifact_vs_disputant_effect = { OWNER = this }

Iron Will: effect agot_create_artifact_vs_iron_will_effect = { OWNER = this }

Heartsbane: effect agot_create_artifact_vs_heartsbane_effect = { OWNER = this }

Ice: effect agot_create_artifact_vs_ice_effect = { OWNER = this }

Lady Forlorn: effect agot_create_artifact_vs_lady_forlorn_effect = { OWNER = this }

Longclaw: effect agot_create_artifact_vs_longclaw_effect = { OWNER = this }

Nightfall: effect agot_create_artifact_vs_nightfall_effect = { OWNER = this }

Orphan-Maker: effect create_artifact_vs_orphan_maker_effect = { OWNER = this }

Pincer: effect agot_create_artifact_vs_pincer_effect = { OWNER = this }

Pride: effect agot_create_artifact_vs_pride_effect = { OWNER = this }

Red Rain: effect agot_create_artifact_vs_red_rain_effect = { OWNER = this }

Seafoam: effect agot_create_artifact_vs_seafoam_effect = { OWNER = this }

Skullcleaver: effect agot_create_artifact_vs_skullcleaver_effect = { OWNER = this }

Stalwart: effect agot_create_artifact_vs_stalwart_effect = { OWNER = this }

Supremacy: effect agot_create_artifact_vs_supremacy_effect = { OWNER = this }

Swordfish: effect agot_create_artifact_vs_swordfish_effect = { OWNER = this }

Tranquility: effect agot_create_artifact_vs_tranquility_effect = { OWNER = this }

Vigilance: effect agot_create_artifact_vs_vigilance_effect = { OWNER = this }

Widestripe: effect agot_create_artifact_vs_widestripe_effect = { OWNER = this }

Remige: effect agot_create_artifact_vs_remige_effect = { OWNER = this }

Wyrmfang: effect agot_create_artifact_vs_wyrmfang_effect = { OWNER = this }

Evergold: effect create_artifact_vs_evergold_effect = { OWNER = this }

Brightroar: effect agot_create_artifact_vs_brightroar_effect = { OWNER = this }

Lamentation: effect agot_create_artifact_vs_lamentation_effect = { OWNER = this }

Robert's Warhammer is difficult to spawn and likely cannot be by anyone but Robert himself. The artifact's requirements are built for him and trying to spawn it for someone else doesn't do anything.

If you want to try it, use;

effect agot_create_artifact_bobby_hammer_effect

Alternatively, Blackfyre and Darksister are both in the game but locked in the files. You can subscribe to my mod, Spawnable Blackfyre and Darksister Swords to unlock them in-game and play with them!