Gaster Shards， and complete the Anti-Void Boss Raid challenge. ，000 Souls， and EXP boosters to unlock and awaken powerful Alternate Universe (AU) Sans and Chara fighters faster. Who is the strongest character in Undertale Multiverse Simulator 1.5? Error Sans and Ink Sans are currently S-Tier leaders due to unblockable soul stun strings and invincible portal dodge frames. How do I awaken Phase 5 Omnipotent AU Sovereign form? Farm 150， What are Undertale Multiverse Simulator 1.5 codes? Codes provide free Souls， reach Level 100 on your chosen AU fighter，。