Undertale's secret boss battle.

 credits: Undertale by toby fox, model by someone in the internet idk

S1xb0n3$ is a monstrosity found in the depths of the true laboratory (undertale), it ONLY appears if we damaged Papyrus to the point he only has 1 hp left. So Sans will take him to the laboratory, in order to get him ''a quick heal'', but something went terribly wrong, and Papyrus starting melting. PAUSE, now I will clarify a few things, for those who aren't Undertale fans: Sans and Papyrus are skeletons, Sans is funny and always makes bad jokes and puns, Papyrus is serious and likes designing puzzles. END OF PAUSE At first the error wasn't notable, but then it became obvious, the syringe wich Papyrus got injected with contained the wrong liquid. Instead of a classic heal potion, he was injected with "determination" a new medicine that would make monsters (or humans) stronger if injected with it, but in a small dosage, nobody knew what could happen if someone got injected more than 1 milliliter of "determination". But Papyrus he got injected a WHOLE syringe, which contains 3-10 milliliters of liquid. So Sans tried to comfort him saying, -"Everything will be fine"- it wasn't fine though, papyrus started melting, and with that, he absorbed Sans, Making him part of a horrible abomination known as S1xb0n3$.

The player can find Sixbones and fight him on the "true laboratory" area, if he/she enters the fridge room, after the player has defeated every other "amalgamation" boss in the place. If those conditions are true, go to the "moving fridge" and interact with it, it will open and Sixbones will come out, and attack the player. If the player kills Sixbones, he/she will be rewarded with the "melted bone" a weapon that deals 18 extra damage. Sixbones is the second secret boss in Undertale.

The fight with Sixbones will be very hard if the player lands the first hit, if Sixbones hits the player first, however, he will attack less often, with less damage, and sometimes skip turns.

The battle will include dialog such as:

*The creature's heads seem to be talking with each other

And

*One of the heads laughs, the other just screams

Image provided by the official Undertale wiki.