What causes the outbreak in hollow knight?

Question

After either acquiring Monarch Wings or killing one of the Dreamers, the Infection will have spread through the Crossroads and orange gunk will appear in the environment.

Hagrid P Hazard · Accepted Answer

After either acquiring Monarch Wings or killing one of the Dreamers, the Infection will have spread through the Crossroads and orange gunk will appear in the environment.

What causes the outbreak in hollow knight?

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