I’m not fully sure whether you mean Roblox Horse RNG or Elden Ring’s Night’s Cavalry , since “night fiend on horse” could point to either. Based on the wording, the most likely match is Night’s Cavalry in Elden Ring , and the easiest way to handle it is to fight on Torrent, keep distance, and punish after its charge attacks.

Quick Scoop

  • Night’s Cavalry only appears at night in Elden Ring, so rest at a Site of Grace and pass time until nightfall first.
  • Fighting on horseback is usually safer than on foot because you can dodge and reposition faster.
  • Its horse has HP too, and if you kill the mount, the rider gets knocked down briefly for a free punish.
  • It can resummon the horse after a short delay, so don’t overcommit during the knockdown window.
  • Status effects like poison and scarlet rot are strong options, and lightning or piercing damage can also help.

Simple method

  1. Clear nearby enemies so the fight stays clean.
  1. Wait until nightfall at a Grace if the boss is not spawning.
  1. Stay just outside the boss’s ideal reach and bait its charge.
  1. Hit after it swings or thrusts, then move away before it turns quickly.
  1. If the horse drops, rush in for damage, but be ready for the resummon shockwave.

If you meant Roblox

If you meant the Roblox game Horse RNG , the results I found were mostly video pages and a beginner guide, not a reliable written method for making a specific “night fiend” horse. The safest answer there is that it looks like a RNG/grind-based game, so the exact steps depend on the in-game roll system rather than a fixed craft recipe.

TL;DR

For Elden Ring , wait until night, fight on Torrent, bait charges, and punish the horse to knock the rider down. For Roblox Horse RNG , I couldn’t verify a specific “night fiend” recipe from the sources I found.