Talk:Stalker/@comment-28968250-20160720161735/@comment-27279105-20160721141432

there are several rumors about death marks, one of them is death mark stacks:

you can gain multiple stacks of death marks. when you're already marked and continue to kill bosses he sends you another love letter, i.e. one more stack. in the profile you will just see if you have >0 stacks. when he attacks, it just consumes one stack. more stacks means higher possibility of being attacked.

that's just what i heard and i'd say it's possible this is true as sometimes the death mark in your profile won't disappear after he came for you (so maybe just one stack was removed).