This is a guide to Revenant and how to unlock (mostly) everything in the map (if I miss anything or get anything wrong, leave it below this discussion and I will add it to this guide later).

In order to turn on the Power and unlock PAP, you must fill up the Blue, Green and Purple Crystals around the map. To start filling up the Crystals, interact with them, and they will become a Soulbox. Once all three of the Crystals are filled up, the Power will turn on and PAP will become available.

To unlock the Stake Knife (which is locked away in a Crypt to the right of Double Tap 2.0), you must obtain a Key in order to unlock the Crypt. In order to obtain the Key, you must wait for a Werewolf to spawn (which usually happens around Wave 10) and once you kill it, a Key will spawn somewhere on the map. You can easily tell where the Key is, because it will have a bright orange glow around it. Once you obtain the key, bring it back to the Crypt and open it. You can now obtain the Stake Knife for 3000 Points.

After you turn on Power & PAP, a floating orange Skull will appear somewhere on the map (NOTE: to my knowledge, the Skull will never spawn in the maze, so don't waste your time running around it). By shooting the Skull, it will vanish and after you wait a Round (sometimes two), it will spawn somewhere else. Once you find and shoot the Skull four times, you can approach a stone casket in the same room as Juggernog and obtain Tombstone Soda (it's price is constantly changing as it's affected by the current round and how many times it has been bought).

Around the map, there are three small Pumpkins that will make faint whispering sounds when you get close to them. The Pumpkins can be found in the following locations: To the left of Widow's Wine underneath a hanging light, to the right of Juggernog near the wall, and to the left of Speed Cola near the gazebo. The song will then play and is Mystery from Dead of the Night.