u/Keyan-on-Reddit

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First image is Educator Sans with Gaster Blaster. Second image is with his book who send code to attack. Third image is his phase 2. 4th image & 5th image are phase 3 but difference is without slashed and with slashed.

Story: A strange Sans known as Educator Sans who appears in unknown area and travel a universe call Undertale.

After enter in Undertale, he watched Classic Sans got killed by Classic Chara. Educator Sans was extreme mad and want to teach a lesson to Chara.