how bout this???
Napalm Grenade
Similar to a Covenant Plasma Grenade, but with one small difference. If the initial explosion doesn’t kill the target, the resulting napalm spray will, as it sticks to the target, effectively burning it to death. The blood-red napalm also makes the kill a lot more satisfying becasue it looks like a spray of gore. This can be set to one of 3 modes: Impact Detonation, Timed Detonation, or Stick. When set to stick mode, the grenade will stick to any surface as long as you hold the trigger down, and when you release it, it explodes, which turns it into a decent substitute for a mine.