Thunder Flash is a Light placeable by the player in FortressCraft. It appears in the 8th Block Wheel. It is not naturally occurring and there is no collision.This light emits a pool of regularly flashing, bluish light. This light colour is overridden if another light model is closer to the player.

You can only delete lights by placing a block over it, then deleting the block that was placed.

This light was on December 19, 2011, in 1.1 Alpha patch, and was retextured on May 17, 2012, in Content Patch 9.