With this plugin when a player reaches this killstreaks(5,15,30,45,60,75,90,100)
he will gain a random potion effect for a minute(fire resistance 5,jump 5,speed 5,haste 5,water breathing 5,invisibility 5,strength 3).
Also a broadcast message will appear
'The player reached amount of kill streak and gain this potion effect !'
It's fully language configurable;
Gives you information about your streak and next streak.
1.8.4 or higher version of Spigot
3.6.4 or higher version of ProtocolLib