Grenade ideas for next halo game

My first idea is to add the fire grenade again
The spike grenade

And to make a grenade that has a purple or black like a black hole color that sucks enemys into his area.
And a grenade that you earn from kills and after you throw it players nearby gets a heal boost or maybe a bit over shield and it has a green color.

Do you have any ideas of your own for weapons veichels or grenades?
i also think that the unsc should have their own melee weapon.

Sorry for my horrible english. :frowning: