Dead road adventures. I’m the dead hero saving the world

You get isekaid into a fantasy world by a goddess like usual but the hero has already been decided and technically it’s not you. They explain the hero was givine OP abilities and whatnot but they accidentally used an ability called “purge blast” on themself and their soul is gone. They say you and and the hero have similar enough personalities so you fit the bill and they’ll through three extra powers as compensation but “purge blast” isn’t one of them. As they finish the whole ritual to send you into they’re body they quickly mention that you’ll become an undead aka a zombie from it.