Worst-case scenario: the UEd Goblin wipes the map and burns down your house.

UE2:Primitive (U2)

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U2 Object >> Primitive (native-only)
Package: 
Engine
Direct subclasses:
Mesh, StaticMesh
This class in other games:
UT, U1, RTNP, U2XMP, UT2003, UT2004

The base class for 3D primitives, like vertex meshes, static meshes or terrain.