For all bosses in other OSRS Gold, they were designed to be used without gravestones, with actual risk. A grave without bless lets you reclaim things from Bandos, KBD, Chaos Ele, Mole and apparently Zammy. DKs, Arma, and Sara are available in a grave with bless. Graves also reduce the likelihood of RS in a significant way. We understand that people won't bless your grave to get their hands on...