Reaper Surges are one of four random events that can happen in the world of Nether.
A Reaper Surge is very similar to the Nether Surge, It lasts 20 minutes and has a percentage meter however there are a couple of differences.
These types of Surges can only be found in Lake Park and is the only way to find and kill a Reaper. While a horde does still occur during this event the percentage meter indicates the health of the Reaper. The Surge can be ended by killing the reaper or by waiting out the 20 minutes.