The Redcap Sapper is an hostile monster added by Twilight Forest. They are only found in Hollow Hills bigger than the smallest size. They hold an Ironwood Pick and wear Ironwood Boots. The Redcap Sapper is a tougher version of their cousin, the Redcap. They have 30 ( × 15) health points and deal 4 () points of damage when attacking. They can also blow players up with TNT to attack, and they have 3 of these to use.
When slain, Redcap Sappers can drop up to 2 Coal, and a chance to drop their Ironwood Pick, or Ironwood Boots.