Add item where surrounding ground is collapsing.
Requires effect that a block deleted "down" below" make upper blocks to fall down (like sand blocks) to provide an collapsing sing effect..

Link til rendering of blocks:
https://forums.minecraftforge.net/topic/79556-1151-rendering-block-manually-clientside/

https://forums.minecraftforge.net/topic/84801-1152-irendertypebuffer-for-use-with-renderworldlastevent/