Stone statue can't be dug

[jojoknob]

In a Lithofex historic site there’s a pileup at a staircase where Lithofexes keep turning each other to stone. The statue then blocks the staircase. Force attacking from above is the only way through (without drill), but the statues do not take extra damage from digging instruments like a pickaxe and are nigh invulnerable as a result.

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