where is the chara corruption battle in this room i hear people talk about it but i cant find it

what are these three other side quests. i cant find them

rare empty Grillby's

Finally finished with the intro

(I won't show everything cuz I want y'all to play it blind)

B 100% NEW HARDEST. HIGHEST HEARTRATE: 170. ATTEMPTS: 813 WHAT LESS ATTEMPTS THAN DEADLOCKED HOW.

48% B going for new hardest!

Bandana Dee the Dream Friend

Smile! Here, take some happy pills! ✨💊 #Blender #3DModelling #3DArt Buy me a Ko-fi: https://ko-fi.com/barbarafb_

Chiaki Nanami!

Path of Kami: The Evolution of the Lore