Here is a quick guide on how to activate the Keeper Protector in the new Black Ops 3 Zombies DLC Revelations.

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Obtaining the Parts

Firstly you're going to want to obtain three parts.

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SKULL
The Skull Piece can be found in one of three locations:
1. Downstairs in Verruckt, on the bookshelf besides Speed Cola.
2. Upstairs on the wheelchair, by the stairs leading out to the Corruption Engine.
3. Upstairs on the wheelchair, just before the jump pad.

PURPLE GEM
The Purple Gem can also be found in three locations:
1. Downstairs in Shangri-La (temple area). Search the wall nearby the primis statues.
2. Right next to the pyramid in Der Eisendrache.
3. On a table, in the small outside room just before the jump pad in Kino.

FLAG
Like the other two parts, the Flag is located in one of three locations around the map:
1. Mob of the Dead, Cafeteria room on the wall.
2. Near the Summoning Altar in Origins, opposite from the generator on the edge mound.
3. Origins, top of the excavation site, in the little hub on your left.

BUILDING THE SUMMONING ALTAR
After all three parts are collected you'll need to go to one of the four summoning altars around the map. The locations for these altars are as follows:

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1. Verruckt upstairs.
2. Shangri-La, lower level downstairs, inside the temple room with the large primis statues.
3. Origins, opposite the generator (where Speed Cola used to be)
4. Kino, on the stage behind teleport

SUMMONING THE KEEPER
Once built at the Summoning Altar the Keeper Protector will require you to contribute 5000 points before it can be summoned.
The Keeper Protector is very similar to the Civil Protector in Shadows of Evil and is believed to be essential to completing the full easter egg (we'll wait and see).

Below is a video with a quick explanation if you can't be bothered reading anything.