Final bosses that can go f themselves

1. Anachronox (2001)
The most tedious boss in existence
GOG: https://www.gog.com/en/game/anachronox

2. Trepang2 (2023)
A 4-stage boss that's only vulnerable when invisible. Also last 2 stages share a single checkpoint.
GOG: https://www.gog.com/en/game/trepang2

3. Haste (2025)
Ruins any fun the game bestowed on you beforehand.
Steam: https://store.steampowered.com/app/1796470

4. Elden Ring (2022)
DLC Radahn is just no.
Steam: https://store.steampowered.com/app/1245620