Base information

• Minecraft version: 1.16.5
• Mod version: 3.0.29.518 - universal
• Minecraft Forge version: 36.2.34
• Mod Pack: Mystical Block

Crash report

(If applicable)

Description / steps to reproduce

I cannot kill Chaos though i destroy all crystal

Not a bug. Be patient and keep hitting the guardian. Get through its shield first, then you'll see the damage bar change.