The first of the Codex Entries is at the mission start. As you exit out of the portal room and look out onto Urdak, you'll see the edges lined with trees. Look to the one to your left to find this ...
The first of the game's Cheat Codes can be found near the end of the level. Walk through the corridor in the image below, and you'll see a yellow question mark hidden behind a gate above you. Continue ...
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