Relics are objects hidden within a player's world that grant the user a special ability. Relics can be found underground, with the exception of the low and ultra low Flatland modes in which they spawn floating in the sky. Relics are available to a player once they have found it no matter who's world they are in. Relics only reset if a player deletes their save from the xbox, resetting the world does not reset relics anymore.

Fortresscraft Wiki[fortresscraft.fandom.com]

Allows the player to fly around.

Makes the player move twice as fast as the normal character speed.

Allows the player to jump 3 blocks high instead of the standard 1.

Allows the player to walk on water.

Can only destroy blocks, but at twice the range of the pickaxe.

Used in the Freeze Tag game mode, only the host can start a Freeze Tag game mode.

Gives a night vision effect on-screen.

Illuminates the area around the player.
Note: the light can only be seen on a detail higher than bump+light

Allows TNT to be detonated.

Digs a straight line of blocks for 60 seconds, is affected by gravity, if placed with the left trigger, the digger will explode after 60 seconds.

Builds in a straight line for 60 seconds, is affected by gravity and will stop if it hits a standard block. Goes through custom blocks.

Used in the Spleef game mode.

Makes the player almost invisible to other people, one of the 3 relics needed for the Hunt game mode. When Activated, zombies ignore you.

Note: Players with optic camo can be faintly seen through other blocks.

One of the 3 relics needed for the Hunt game mode.

Gives a thermal vision-like effect on screen, effect can be changed with the left trigger. One of the 3 relics needed for the Hunt game mode.

Thanks to the Wiki for the Images & Text. I'll be updating the images in the future with high quality images and for any new relics that happen to come in future updates.