[@Keksalot] All the information about this setting's vampires that I'm aware of is located in the Shadowhunters Wiki page, as seen [url=http://shadowhunters.wikia.com/wiki/Vampire]here,[/url] though I recommend looking for the relevant wiki pages yourself in the future, given that a link to the wiki has been provided in the first post. To answer your question specifically, I don't believe vampires can typically alter themselves in that fashion - accelerated healing in general is automatic in this setting, though Shadowhunters need to apply an [i]iratze[/i] Mark to heal their wounds more quickly, and I imagine a vampire removing their own heart would probably die in about the same fashion as a vampire getting staked through the heart, since the sentiment is about the same in both cases.