If a Pestilence attacks, or is attacked by a fully powered up Juggernaut, and Juggernaut dies, then Pestilence will absorb the power of the Juggernaut and become Hyper Pestilence.
Hyper Pestilence:
Unstoppable Attack, Invincible Defence
Kills anyone who visits your or your target.
Cannot be roleblocked, controlled, or jailed.
If jailed, you will rampage at yourself, the Jailor, and your original target.
This means that if you are jailed while Hyper, and someone visits you, they will die.