Oh I see, so it's a command which is being abused. They are killing MVPs like porings

this command kills the essence of "BOSS HUNTING". So I'm boss hunting manually using flywings, warps etc. and they are just using this command to teleport again to the exact location of the BOSS.
Basically you just need to find the boss and save the coordinates and warp exactly to the BOSS location over and over again. GLOOM, BELZEE, FALLEN, VALK being killed like porings.