Arkane Studios' Deathloop contains a unique mechanic that involves a timeloop.
When the loop resets, everything in the world resets with it and ultimately you can lose a lot of your stuff.
However, there is a way to keep your items and carry them over into future loops - this is called Infusion.
Here's how to Infuse items in Deathloop.
How To Infuse Weapons, Trinkets And Slabs
How To Get The Infuse Ability
Players can infuse items to carry them across loops using Residuum. However, you'll first have to progress through the game enough to gain the ability. After progressing through the first few hours of the game, you'll be tasked with finding and taking down Wenjie. Wenjie has many different versions of herself at the Complex and will require you to kill them all and harvest the final Wenjie.
How To Collect Residuum
Residuum is the fuel that powers Infusing and it's collected by harvesting objects you've taken with you, collecting it off objects left on Blackreef (they also emit a strange hue/glow) or by killing Visionaries and collecting it off them.
How To Use Infuse Items
You'll need to access the menu screen and go to your loadout. Go to any of your weapons and press Enter to Infuse your weapon or Delete to Sacrifice it.