serial killer

This effect gives static buffs, as opposed to the usual social buffs. this is due to the social isolation of killers. if you want something different, just make your own table rules. the call of the blood changes from player to player. this is specific to the type of ritual you choose for your killings. the standard the I use is once every 2 weeks for the player at my table who uses this. if you want this more for aesthetic than the actual wish to hunt your urban prey, i suggest choosing a very specific date, like the summer solstice, or the last week of the year. 

when you begin to feel the call of the blood, you gain the aforementioned effect, which gives +5 passive perception.                                                                                                                        Those with this background can select a target, and stalk that target for up to 1 week without them noticing. when you spend a day stalking them, you gain knowledge of their schedule for that day of the week, for 20% total of their daily schedule. a second day gets you to 40% completion on their daily schedule, 60% the next day, until the 5th day where you know 100% of their daily schedule.  You can choose to kill them before knowing their schedule, which will result in a roll of a D 20. the increment for success changes based on the % of their schedule known. at 0 % you must roll an 18 or higher, or you will be seen (not caught, seen.) at 20%, 16 or higher. at 40% 14 or higher. at 60%, 12 or higher. and 80 %, 10 or higher. at 100%, you will have full knowledge of guard patrols, the patterns of any neighbors or people who move through the area at specific intervals, and any other information relative to the act of isolating one target. 

when you fully understand their schedule, you can begin planning their death. any targets must be killed a ritualistic manner, requiring at least 3 specific preconditions to be met. one of these can be met with the target type (such as their gender, size, hair color, race, or any other defining factor) other options include the location, this can be the same location every time, or just a type of location. for instance it could be a specific dock in one city, or just any dock in any city. time of the year, day or week of the month, day of the week, hour of the day, or any combination, up as specific as something like midnight on the winter solstice.  method. this refers to how they are killed, which is self explanatory. weapon, which can be more than just a dagger or an axe, but something as creative and specific as a letter opener your mother used to use. and finally setting. this can require inserting yourself into the targets life. a common example would be they must be killed at the end of a date with you the killer. but don't be afraid of getting creative. 

finally when they are killed, the body must be displayed or disposed of. this can be something as simple as leaving the gruesome scene of their dismemberment for the guards to find, to complex displaying that require time, effort, and rare items. don't be afraid to be wild and crazy with the displaying. as for disposal, the more you know the area, the easier it will become. if you are playing a disposal type killer, you will be wanting to take the whole 5 days to begin with, as this type of kill is most notable in meticulous killers who wish not to be caught by any means. 

If you choose to kill them before 5 full days of stalking, you must still complete the rituals included, and either display or dispose of the body. for these two stages, ritual and display or disposal, you use the same D 20 rolls as for the actual kill itself. but the needed roll increases by 1 with each stage. meaning the at 0%, at the 2nd stage, you will need to roll a 19, and a 20 at the 3rd. this is because your lack of knowledge, and the ensuing slopping kill, will create more opportunities to be seen, and to be caught. at 100% you will be able to put on the most elaborate displays and the best disposals, even completely destroying the body if you wish. as well, you will be able to complete your rituals uninterrupted.

once the kill has been finished, you gain the effect "after the blood" you lose the passive perception call of the blood gives you, but gain advantage on saving throws to being charmed or feared.