To obtain the Rune, you need to first activate the Pack-a-Punch machine by shooting seven colored pumpkins around the map. Once the Pack-a-Punch is activated, you pack-a-punch any weapon and then trade it at a rock. This action will yield the Rune.
This video provides a step-by-step guide on how to obtain the Rune and Key in Michael's Zombies during the Halloween Spotlight event. The narrator explains how to activate the Pack-a-Punch, find the Rune by interacting with a rock, and then decipher a code using a UV light to unlock a vault for the Key. The video also touches upon the potential randomness of certain codes and offers strategies for different maps.
To find the code symbols for the vault using the UV light, you need to: