Webdemon slayer mark comes as a reward to the demon slayers/ hashira, who grow in terms of power and experience.
The first person to have this mark was yoriichi,.
Webkokushibo and tanjiro kamado are the only known demons to possess the demon slayer mark, due to having activated it before they transformed.
Tengen uzui and shinobu.
Webdemon slayer 3 features two hashira awakening the mark and gaining tremendous strength in return.
Here’s what you need to know about it.