Stealth is a game mechanic where players are able to turn semi- or fully invisible to other players. Both the Witch Elf and Witch Hunter careers have stealth abilities Shadow Prowler and Incognito, respectively. Each ability is gained at rank (level) 10. In general, stealth in WAR is less powerful than in other MMO games, since it drains Action Points over time and thus means you can only stealth for a short duration.
Despite early indications that no such mechanic would appear in WAR, gameplay videos have since shown otherwise.