concussiveblast

This entity is not in the FGD by default.
It should not be put directly in a map because it can only be configured through code.

Class hierarchy
CConcussiveBlast ↳CBaseEntity
weapon_cguard.cpp

concussiveblast is a point entity available in Half-Life 2 series, Portal, and Source SDK Bases. This entity appears to have been intended for weapon_cguard, an unused weapon from the Half-Life 2 Beta. It is now used by striders as the centerpiece of their cannon blast, functioning as the explosion that deals the actual damage and creates the warp effect.