Ending 1 - The Inglorious End: This is the default Game Over.

Ending 2 - That Was So Close: This is an alternate Game Over ending, when you die on the fifth floor of the Nexoria Dungeon.

Ending 3 - First Victory: Defeat the final boss in the Nexoria Dungeon in a first playthrough.

Ending 4 - Witch: Defeat the boss in the Dark Forest.

Ending 5 - Annihilation of Darkness: Defeat the final boss in the Nexoria Dungeon in a second playthrough.

Ending 6 - The Dragon: Defeat the final boss in the Nexoria Dungeon in a third playthrough.

Ending 7 - A Inglorious Victory: On the fourth floor, a special event might occur where you get challenged to a trial. If you agree, you will be thrown in a fight against 2 boss at the same time. Defeat them to get the ending. The picture below is the event.