Collecting items throughout the Pale Heart and getting rewarded is one of my favorite aspects of the TFS expansion. If you want a cool reward, you should check out how to complete all Paranormal Activities in Destiny 2 The Final Shape, and find all Paracausal Geometries.
Where to find all Paracausal Geometries in Destiny 2 The Final Shape (Paranormal Activities)
In order to even have the activities available, you have to complete the 'Alone in the Dark' by Micah 11 times. You also need to complete this quest six times to unlock Cyst events (one of the steps required to get the Khvostov 7G-0X auto-rifle), so it's a two-birds-with-one-stone type of situation. Once you complete a quest, you'll unlock a Paranormal Activity marker on the map.
When you reach the location of the Paranormal Activity, look for a light that you should commune with. Once you do, this will give you the 'Aura of Balance' buff. While it's active, you have to connect two cubes (Paracausal Geometries) together. You have to shoot Light energy at the cube with a blue square, and you shoot Dark energy at the cube with a red triangle.
Some locations of the Paracausal Geometries are hidden, but thanks to amazing members of the community like Esoterickk (who has also shared Destiny 2 TFS cutscenes for anyone affected by bugs pre-raid), it shouldn't be too difficult to find them all.
The Transgression Paranormal Activity
Once you commune with the light, jump down and get underneath the platform. There's a hallway that allows you to see the Light cube to the left and the Darkness cube to the right, so connecting them isn't too difficult.
The Blooming Paranormal Activity
From the light, climb up to the left (after you commune with it). Head down the path to the left, and you'll reach the Light Paracausal Geometry. Get right underneath it and look to the left. You should be able to see the Darkness Paracausal Geometry through the crack in between a stone and the cliff side.
The Impasse Paranormal Activity
Commune with the light on the platform, then look to your left. You'll see the Darkness Paracausal Geometry, but don't shoot it yet. Instead, head in that direction. You'll see a pillar that you can climb on. From this vantage point, you'll still see the Dark cube as well as the Light cube to the left.
The Lost City Paranormal Activity
Once you commune with the light, jump to the roof of the building across from the one you are in. Turn back around, and you'll see the Light Paracausal Geometry on the roof. The Darkness Geometry is to your right, behind the large supporting cable.
The Lost City Outskirts Paranormal Activity
In the Outskirts of the Lost City, you will find another Paranormal Activity. Commune with the light, then head towards the stairs to the left. You'll see a green door and the Light Paracausal Geometry through it. Place yourself so that you can also see the Darkness Paracausal Geometry underneath the tree to the left.
The Seclusion Paranormal Activity
After you commune with the light, you'll see the Light cube on a platform to the left. Jump over to it and keep going to the next platform. Once there, you will have a good view of the Darkness cube, which is immediately to your right, and the Light cube you passed on your way.
The Landing Paranormal Activity
First, commune with the light, then climb up on the tree root arching to your left. When you look back, you'll see a window to a building. Get to it and stand on the ledge. The Light cube will be in the water to the left, while the Darkness cube will be underneath the waterfall to the right.
The Forgotten Deep Paranormal Activity
Jump onto the building across from the light and climb up to the high vantage point. The Darkness Paracausal Geometry is right off the side of the building. Look back, and you'll find the Light Paracausal Geometry above one of the canopies.
The Blooming Deep Paranormal Activity
The Darkness Paracausal Geometry is right next to the light, but you can't see the other Geometry from here. Instead, head to the left and keep going until you reach a ledge where you can see the Light Geometry. The Darkness one should be in your line of sight as well from here.
The Divide Paranormal Activity
The walk for the Dividive Paranormal Activity is pretty long. Once you commune with the light, rush up the hill to the right and keep climbing until you reach a structure that looks to be a part of a ship. Head inside it and to the right until you reach the ledge. Look down, and the Light Geometry will be there. After shooting it, turn back towards the structure, and you'll see the Darkness Geometry inside.
The Refraction Paranormal Activity
After communing with the light, head down the path to the left and towards the cliff. You'll see a ledge that you need to get to. When you climb up, look down to the left, and you will vaguely see the Light Paracausal Geometry through the trees. The Darkness Paracausal Geometry is close to the waterfall.
Once you have completed all Paranormal Activities in the Pale Heart, you will unlock a secret ship called The First Knife. This is an exotic ship that doesn't have any effect on the gameplay, just like any other ship skin (though choosing the best-looking ship absolutely affects my coolness).
If you want to know how to get one of the best weapons in the game, check out How to get legendary and exotic Khvostov 7G-0X auto rifle in Destiny 2 on Pro Game Guides.
