Required resource pack at https://github.com/cometcake575/KillStrength/raw/main/KillStrength.zip (add to your server.properties)
KillEffect is a unique plugin, where you choose from six effects: Strength, Speed, Hero Of The Village, Haste, Regeneration and Jump Boost.
Whenever you kill a player you gain a positive level of that effect, the max level of positive effect is two, it's opposite for the negative versions of the effects.
Whenever you die you gain a negative effect instead. The max level of the negative effect is 2, decreasing once per death.
Effects and their negative counterparts:
Strength:
Speed:
Hero Of The Village:
Haste:
Regeneration:
Jump Boost:
There are some more additions like if you die not to a player a bottle drops of a effect level for traps, I am so grateful for Starshooter for making this plugin for Wrath SMP, Check out his other plugins like Origins-Reborn.