E-Wok Bomb

Six seconds to arm, then a 45-second countdown that nothing calls off — a beam and a swelling dome mark the ground while it runs. Everything inside 30 m is levelled and the blast still bites out to 100 m, without distinguishing between whoever set it and whoever happened to be nearby. It stays carryable while armed, so it can be repositioned or walked onto a target that would otherwise leave the radius.