Door boss

A door boss is an unofficial name for the first of two boss encounters in some  trials or  raids that does not award loot upon defeating it, but grants the party a checkpoint that they will restart from if they wipe to the second boss. Note that exiting the instance and re-entering will require defeating the door boss again.

Dungeons

Duty	Door boss	Final boss
The Aetherochemical Research Facility	Lahabrea and Igeyorhm	Ascian Prime

Trials

Duty	Door boss	Final boss
The Porta Decumana*	The Ultima Weapon (Phase 1)	The Ultima Weapon (Phase 2)
Battle on the Big Bridge	Gilgamesh (Phase 1)	Gilgamesh (Phase 2)
Battle in the Big Keep	Gilgamesh and Enkidu	Gilgamesh (Phase 2)
The Crown of the Immaculate*	Innocence (Phase 1)	Innocence (Phase 2)
The Dying Gasp*	Hades (Phase 1)	Hades (Phases 2-3)
The Seat of Sacrifice*	Warrior of Light (Phase 1)	Warrior of Light (Phase 2)
Cinder Drift	The Ruby Weapon (Phase 1)	The Ruby Weapon (Phase 2)
Cinder Drift (Extreme)	The Ruby Weapon (Phase 1)	The Ruby Weapon (Phase 2)
Castrum Marinum	The Emerald Weapon (Phase 1)	The Emerald Weapon (Phase 2)
Castrum Marinum (Extreme)	The Emerald Weapon (Phase 1)	The Emerald Weapon (Phase 2)
Everkeep*	Zoraal Ja (Phase 1)	Zoraal Ja (Phase 2)

*Note that the extreme-difficulty versions of these encounters do not have checkpoints.

Normal and Savage Raids

Door bosses in raids have become more prominent since  Omega: Deltascape (Savage) in patch 4.05. These are typically found in the final (fourth) encounter of each savage raid tier. The second phase of the encounter is a savage-exclusive boss that is not present in the normal-difficulty version. Since then, only three fourth-floor savage raids:  Eden's Gate: Sepulture (Savage),  Eden's Verse: Refulgence (Savage), and  AAC Light-heavyweight M4 (Savage), do not have a door boss or checkpoint.

While older door bosses in savage raids have been relatively short encounters, newer door bosses since  Eden's Promise: Eternity (Savage) are often full-fledged, 7-8 minute boss encounters by themselves and compose a little less than half of the total fight time. In general, more emphasis is placed on the difficulty of mechanical execution for the door boss, while the second phase of the savage encounter is more structured as a puzzle. The door boss also tends to have a somewhat higher DPS requirement than the final boss.

Note that non-boss enemies, such as trash mobs in older raids, are excluded in the following table.

Duty	Door boss	Final boss
The Binding Coil of Bahamut - Turn 1	ADS	Caduceus
Alexander - The Fist of the Father	Faust	Oppressor
Alexander - The Fist of the Father (Savage)	Faust	Oppressor
Alexander - The Fist of the Son	Faust x2, Hummelfaust	Ratfinx Twinkledinks
Alexander - The Fist of the Son (Savage)	Faust x2, Hummelfaust	Ratfinx Twinkledinks
Alexander - The Eyes of the Creator	Faust Z	Refurbisher 0
Alexander - The Eyes of the Creator (Savage)	Faust Z	Refurbisher 0
Deltascape V4.0 (Savage)	Exdeath	Neo Exdeath
Sigmascape V4.0 (Savage)	Kefka (Phase 1)	Kefka (Phase 2)
Alphascape V4.0 (Savage)	Omega-M and Omega-F	Omega
Eden's Promise: Eternity (Savage)	Eden's Promise	Oracle of Darkness
Asphodelos: The Fourth Circle (Savage)	Hesperos (Phase 1)	Hesperos (Phase 2)
Abyssos: The Eighth Circle (Savage)	Hephaistos (Phase 1)	Hephaistos (Phase 2)
Anabaseios: The Twelfth Circle (Savage)	Athena	Pallas Athena

Alliance Raids

The final boss of some alliance raids contains a checkpoint.

Duty	Door boss	Final boss
Dun Scaith	Diabolos	Diabolos Hollow
The Orbonne Monastery	Ultima, the High Seraph (Phases 1-2)	Ultima, the High Seraph (Phase 3)
The Puppets' Bunker	The Compound	Compound 2P
The Tower at Paradigm's Breach	False Idol	Her Inflorescence

Ultimate Raids

Duty	Door boss	Final boss
Dragonsong's Reprise (Ultimate)	Ser Adelphel, Ser Grinnaux, and Ser Charibert	King Thordan, Nidhogg, Hraesvelgr, Dragon-king Thordan (Phases 2-7)