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Your Eternal Reward is a community-created melee weapon for the Spy. It is a long, ornate dagger with distinctive oriental designs, a team-colored wooden handle, and a curved golden hilt. The other side of the handle, when holding the knife, has a crack in it.

This weapon retains the instant-kill backstab ability of the Knife, but with some tweaks. Upon a successful backstab, the Spy instantaneously disguises as the target without the puffs of smoke that usually surround a disguising Spy. Furthermore, the victim does not scream upon death (although there is still the actual noise of the backstab per se), nor does a death notice appear in the enemy team's kill feed. Also, the corpse of the victim fades away almost instantly as if cloaking (unless that user has the Bombinomicon equipped, then there is the exploding death effect with no fade). Finally, the Spy does not use any voice responses, including lines for dominations, on a successful backstab to prevent drawing unnecessary attention. The process is so quick and unnoticeable that the Spy is never revealed between disguises. Therefore, Sentry Guns are unable to target the Spy between backstabs, making it easier to backstab unaware Engineers and sap their buildings. Upon backstabbing someone who is being healed by a Medic, the healing beam is automatically transfered to the Spy. The player still retains the ability to change and reload their disguise weapon, as with the Disguise Kit. Altogether, backstabs become much more difficult to track, as victims disappear silently with the Spy instantly taking their place in battle.

However, the disguise effect is not activated if the target does not die from the backstab; namely, if the target is wearing a Razorback or is invulnerable. Non-backstab kills achieved do not grant the Spy the victim's disguise and the kill appears in the killfeed, but the kill is still silent and the corpse of the victim disappears.

Non-backstab disguises cost an entire Cloak meter (outside of spawn) and can only be done if the Cloak meter is full and if the user is not cloaking, while disguises from backstabs consume no Cloak at all. The Cloak drain rate is also increased by 33%. This penalty affects the Dead Ringer to a lesser degree due to its innate cloak duration bonus. If L'Etranger is equipped, the drain penalty is nullified and the cloak duration bonus of L'Etranger is halved.

If the player backstabs an enemy Spy who is currently disguised as a member of the player's team, the player does not receive the disguise of the player's own team member, and instead disguises as the enemy Spy.

Taunting with Your Eternal Reward equipped results in the Fencing kill taunt. Kills made are silent and the victim's corpse disappears. However, the disguise effect is not activated even if the taunt hits the victim's back.

In Mann vs. Machine, the Your Eternal Reward undisguises before applying the disguise. This causes the robots to still target you. The kill icon for Your Eternal Reward was contributed by Psyke.