I couldn’t verify a specific drop rate for the “Tengen sword” from the available info, so I can’t give an exact chance without knowing which game you mean. The results I found point to Weak Legacy 2 and other Demon Slayer- related Roblox pages, but none of them show a confirmed Tengen sword drop percentage.

What this likely means

  • If you mean a Roblox game, the sword may come from a boss drop, raid reward, or spin system rather than a fixed craft recipe.
  • In that case, the chance is usually set by the game’s current loot table and can change with updates.
  • Community pages and forum threads often discuss whether the weapon is real or usable, but they do not reliably confirm drop odds.

Best practical answer

  • The chance is unknown from the sources I could verify.
  • If you tell me the exact game name, I can narrow it down to the correct item and likely source.
  • For now, the safest assumption is that it is a rare drop or reward , not a guaranteed unlock.

TL;DR

I can’t confirm an exact chance for the Tengen sword from the verified sources available, but it appears to be tied to a Roblox Demon Slayer-style game and likely comes from a rare drop or reward system.