In case you don,t want to constantly open your DS4 pdf to figure out what Slayer Points do (p.43 btw if it's what you want to do), I thought I'd make a table here telling you what they do.
SP Free Action/Bonus
1 Ignore 2 damage
1 Cooldown Period -1 round
1 Defense +3
1 Opponent's Defense -1
1 Get up in melee
1 Movement Rate +1
1 Change/pick up/draw weapon
2 Dodge once*
2 Ignore 6 damage
2 Cooldown Period -3 rounds
2 Defense +8
2 Attack +2
2 Opponent's Defense -2
2 Movement Rating +2
2 Repeat failed attack**
2 Change spell (check required)
3 Second attack in round
3 Ignore 9 damage
3 Cooldown Period -10 rounds
3 Defnese +12
3 Knock over injured opponent***
3 Opponent's Defense -4
3 Movement Rate +3
* As with talent of same name.
** Does not apply to fumbles.
*** Does not apply to gigantic (Huge? going to have to check that for the errata...) or larger opponents.