First, you kill someone, then you gain a very small temporary boost (more damage or life, for example), but the boost wears off slowly, but you will become weaker than you were in first place! The deboost will wear off too, but in a longer time.
So, if you want to continue strong you will have to kill more and more, until you become a crazy PK, yet fragile because you will have to maintain your killing spree.
This is how the boost formula works:
Kill
boost
boost weakens by -10% each hour (or more/less) until -200%
the extra weakening (-100%) wears off too, but slower (maybe half the speed)
This is a PKing timeline:
___________________Current boost %
Kill_________________100
boost weakens_______90
Kill_________________90 + 100 = 190
boost weakens_______80 + 90 = 170
boost weakens_______70 + 80 = 150
Kill_________________70 + 80 + 100 = 250
Kill_________________70 + 80 + 100 + 100 = 350
boost weakens_______60 + 70 + 90 + 90 = 310
boost weakens x 5____10 + 20 + 40 + 40 = 110 (fast fowarding just to not spam "boost weakens" lots of times)
boost weakens x 5____-40 + -30 + -10 + -10 = -90
boost weakens x 6____-100 + -90 + -70 + -70 = -330
boost weakens x 2____-90 + -100 + -90 + -90 = -370
boost weakens x 6____-60 + -70 + -80 + -80 = -290
and so on until 0%...
Please note that the % is the boost %, not the player's stats %.
Maybe you can have some kind of temporary PK skills that depends on your vocation and victim's vocation, that uses up boost % too, like invisibility (from players) and this kind of PKey stuff, but not something that may help you against creatures. For example:
Skill_________PK Voc______V Voc______% required_____% used
Invisibility____Ranger______Any_______50%__________1% sec
Rage________Warlock_____Any_______-500%_________500%
Taunt_______Knight_______K/P_______50%__________1% 5 sec
Invisibility:
Makes you invisible ONLY to players (not creatures).
If current boost % gets lower than 50% invisibility wears off.
Rage:
Explodes in rage causing damage to nearby players.
You need NEGATIVE boost to use it.
Taunt:
If a player tries to attack someone, he will attack Taunt's caster instead.
If current boost % gets lower than 50% Taunt wears off.
Only Knight's and Paladin's victim boost % can be used to cast Taunt.
This way there is going to have "Vocation Killing Experts" and more PK teamworking.
Sorry about my English it is not my main language.
Well, that's it. Cya.
(Woot, first post

Edit: Omg, first post of the page, i ALWAYS make the first post of the page, its like some kind of curse...)