Ghostwalker in Rivals is usually understood as a stealth/assassin-style weapon or item that makes you harder to see and more dangerous as you build it up through kills. In the references I found, the Ghostwalker concept is described as becoming more transparent with each level, increasing damage, and eventually giving near-full invisibility at max level.

Quick scoop

  • It gives you better mobility early on, including a higher jump.
  • It becomes more invisible as you get more eliminations.
  • At max power, it hits much harder and is meant more for stealth kills than direct duels.
  • Some players use it to farm kills or play sneaky rather than brawling head-on.

Important note

The result I found is for Ghostwalker , but it appears to be from a Roblox sword/item context rather than a clearly identified “Rivals” game item specifically. If you mean a different Rivals, the exact effect could be different.