If you didn't get hit and keep sparing undyne in undyne's 3rd phase, you could reach the hidden phase and ending, which shows Undyne had perfectly mixed herself with all Amalgamates and become the goddess of the earth (Daichi no Megami), now her vessel is fullfilled with the earth itself's will and gonna act what The Earth really want to do.
10 months ago
[Undertale: Here We Are] - Phase 4 (Hidden Phase): The True Earth
Next up
[Ultraman Arc] - Arc No Theme (School Project)
[Undertale: Here We Are] - Pre-phase 1: Dash!
[SP!Dusttale] - RED ASPERGERANIA
After 7 long years, the wait is finally over. Chapters 1-4 of DELTARUNE are out now!
Celebrate the parallel story to Undertale by completing these quests.
[Undertale: Here We Are] - Undyne Phase 1 Battle sprite by @Sharfav3in 
[Undertale: Here We Are] - Phase 1: Reaper
[Undertale: Papyrus Has Gone Too Far] - TERALAZING
Undertale, but nothing's wrong.
[Undertale] - So Sorry
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