Xylia
Terrarian
Fairly sure it is unless it gets hit directly by the V. and even if it did, at least some portion of the surface should be safe. Chlorophyte should take care of the underground.
EDIT: I hope you lined the tunnels (at least down to the 'underground' level) with some sort of material other than mud or dirt, like Clay, Wood, etc that can't be corrupted. Otherwise you could have corrupt grass on one edge of the tunnel and the resulting thorny vines would spread the corruption to the other side.
EDIT: I hope you lined the tunnels (at least down to the 'underground' level) with some sort of material other than mud or dirt, like Clay, Wood, etc that can't be corrupted. Otherwise you could have corrupt grass on one edge of the tunnel and the resulting thorny vines would spread the corruption to the other side.
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