Whose brilliant idea was that?
You literally stole the name of one of the most universally-reviled abilities from Call of Duty… it’s not that you didn’t know how this adversely affected other games in the past, you were fully aware and chose to replicate it anyway, right down to the name.
Martyrdom completely changes the landscape of the game, as any kill on Nader will mean everyone has to stop progression through that part of the map completely and wait to see if her nade goes off. This is a fast-moving game focused on hip-fire with close- to medium-range weapons; martyrdom stifles that. It kills momentum and, moreover, is counter-intuitive to competitive play. A person should never be granted an instant-kill ability for dying, no matter how small the radius winds up being.
Honestly, this really needs to get the boot completely, but if not, at least make it an immense cooldown (not something that can be used every life unless you have long lives), or delay the time before you can activate it in the down-state, or the fuse of the grenade. But honestly, this sort of thing is really cancerous, and should be removed entirely.