Vertex Displacement Mixer
The Vertex Displacement Mixer allows you to mix two (2) Vertex Displacement nodes.

Displacement 1 - Connects a Vertex Displacement node to Input #1.
Blend Weight 1 - Controls the mix amount of the connected Vertex Displacement node.
Displacement 2 - Connects a Vertex Displacement node to Input #2.
Blend Weight 2 - Controls the mix amount of the connected Vertex Displacement node.