This page will show you all the Openers, and Rotations for Summoner (SMN) in patch 6.05 in Endwalker.

General Opener

Summoner General Opener.

Precast Ruin III about 1.5 seconds before the fight
Weave in Searing Light . This will buff the entire party for 3% extra damage, and will last for 30 seconds.
Cast Ruin III again.
Cast Summon Bahumut .
In Bahaumt, cast Astral Impulse .
Use a Tincture of Intelligence .
Cast Astral Impulse a second time.
Weave in Energy Drain .
Cast Astral Impulse for a third time.
Weave in Akh Morn and Fester .
Cast Astral Impulse for a fourth time.
Weave in Deathflare and Energy Drain .
Cast Astral Impulse for a fifth time.
Cast Astral Impulse for a sixth time.
Cast Summon Titan II .
Cast Topaz Rite .
Weave in Mountain Buster .
Cast Topaz Rite a second time.
Weave in Mountain Buster a second time.
Cast Topaz Rite a third time.
Weave in Mountain Buster a third time.
Cast Topaz Rite a fourth time.
Weave in Mountain Buster a fourth time.
Cast Summon Garuda II .
Weave in a Swiftcast .
Finish with Slipstream .

Early Garuda Opener

Summoner Early Garuda Opener.

Precast Ruin III about 1.5 seconds before the fight
Weave in Searing Light . This will buff the entire party for 3% extra damage, and will last for 30 seconds.
Cast Ruin III again.
Cast Summon Bahumut .
In Bahaumt, cast Astral Impulse .
Use a Tincture of Intelligence .
Cast Astral Impulse a second time.
Weave in Energy Drain .
Cast Astral Impulse for a third time.
Weave in Akh Morn and Fester .
Cast Astral Impulse for a fourth time.
Weave in Deathflare and Energy Drain .
Cast Astral Impulse for a fifth time.
Cast Astral Impulse for a sixth time.
Cast Summon Garuda II .
Weave in a Swiftcast .
Cast Slipstream .
Cast Emerald Rite .
Cast Emerald Rite a second time.
Cast Emerald Rite a third time.
Cast Emerald Rite a fourth time.
Cast Summon Titan II .