Update v1.2.1:
[New Content overview]
Hubris challenge: additional challenges that you can opt into during the Ascended Reaper difficulty mode playthrough.

Reworked bosses: 9 major bosses that got new patterns and AI behavior with the Hubris challenge modifier. By accepting the challenge at the beginning of the stage, you can face the reworked bosses. Here's a list of bosses that got revamped with this update.

Stage 3-3 Boss

Stage 4-2 Boss

Stage 5-4 Boss

Stage 7-3 Boss

Stage 7-4 Boss

Stage 8-3 Boss

Stage 9-2 Boss

Stage 10-3 Boss

Stage 11-2 Boss

Chamber of Hubris, and the last and final optional boss challenge

To enter the Chamber of Hubris, you must beat the final boss and see the ending of the base game.

The entrance portal will appear in the training ground.

To face the optional boss, you have to beat all the hubris-modified bosses listed above.

[Patches]
Background arts in 6-1 and 6-2 are updated with more details.

The boss of Stage 10-3 got a different color of projectiles.

Changed the damage system of the player. From now on, when you are getting the DoT damage (via lava or poison clouds), you can get damaged by other types of attacks and get knocked out. (previously, it had a short invincibility time, which caused unintended attack misses from the enemies)

Additional Achievements according to the new update.