To go along with the bug fix in the last update, I forgot to change one of the creatures in the rewards.yml
Please either regen the rewards.yml or change "Ender_Guardian" to "Elder_Guardian"
As for the feature update:
You are now able to set a custom timer and amplifier for each of the different potion effects for both the killer penalty and death penalty. Now, each potion effect will follow the format of
WEAKNESS:
Amplifier: 1
Timer: 10
You can add as many potion effects as you like, and as long as they follow that format they will all be added with the custom timer and amplifier.