Your mission in the Armory of Reckoning is to destroy the Ammo Printers. There are a lot of dangerous Grunts in this area but there are also 5 Collectibles you can get in the area. This guide will show you where to find all the collectibles in the Armory of Reckoning.
The Spartan Core is in the southwestern part of the area. Go to your right and enter the building to your left. Keep going inside and down the building until you find a gun on top of a crate to your right, the Spartan core is next to it.
Banished Audio Logs
In the same area where you found the Spartan Core, go to your left and keep going up until you reach a Gravity Lift. The first Banished Log is on the ground near the Gravity Lift.
The second Banished Audio Log is on the northern part of the Armory of Reckoning. Go inside the building and you will find the second Audio Log at the end of the hallway.
UNSC Audio Logs
Near the area where you found the second Banished Log, go to the left and climb the hill. You will find a dead end and the first Audio Log is on the ground next to a rope.
Go to the northwestern road of the Armory of Reckoning. Near the mountainside, you will find a broken truck and the second Audio Log is on top of it.