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Etna Mode is a bonus feature found in the remakes Disgaea: Afternoon of Darkness and Disgaea DS. As the name suggests, it features an alternate storyline focusing on Etna rather than Laharl. A similar mode, named Axel Mode is present in the Disgaea 2: Cursed Memories port Disgaea 2: Dark Hero Days. For some reason the mobile gaming port of the sequel doesn't have online play like the original game ports do.
The story starts off as usual, but once Laharl gets up, he shouts instead of speaking calmly, which is what probably prompts Etna to shoot instead of putting away the gun. Thus, she kills Laharl. Without the prince, her plan of pitting Laharl against Maderas to regain her memories is ruined. She first attempts to make the Netherworld believe the prince is still alive by sticking a pair of antennae on a Prinny, but most demons including Maderas and Vyers see through the paper thin disguise. She then attempts to retrieve her memories from their hiding place in the Sea of Gehenna, but is stopped by Maderas who almost destroys her memories. Vyers shows up unexpectedly, stops Maderas, and convinces Maderas and Etna to battle for the memories in an all-out duel. Etna manages to retrieve her memories before fighting Maderas, who is killed by Vulcanus. In the end, Etna's remembers her promise to keep Laharl safe and sheds tears for killing him, but we later learn that he was merely unconscious.
- At the title screen, highlight the "New Game" option, then press Triangle, Square, Circle, Triangle, Square, Circle, X. (X,Y,B,X,Y,B,A on the DS.) If you entered the code correctly, you will hear Etna's voice.
- Alternatively, successfully complete the game after reading Etna's entries in her secret chamber. To enter Etna's secret chamber, press the two secret buttons in Laharl's Castle. The first button is behind the throne. The second button is inside the skull on the counter in RosenQueen's store. After both buttons are pressed, go to the room where Longinus, Ghoss, Stigma, and Gargo are usually found. Press X in the corner behind Stigma (the prinny) to reveal the door. If the player uses this method instead of the cheat code, the enemies will be much higher in level in the next cycle if you choose to play Etna Mode.
Etna Mode for the PSP and DS is the only mode in the entire series known to have a stage in which an enemy has an ability learned from another source. (Episode 2: Stage 2. Enemy: Female Healer. Ability: "Slumber." This is originally a monster ability inducing the Sleep status ailment.)