Halo 2 introduced the Arbiter as a playable character — the first time Halo split its perspective between Master Chief and a Covenant Elite. The structural decision was controversial at release; fans wanted more Chief. Revisiting the game reveals that the Arbiter sections are dramatically stronger than their reputation suggests, and contain dialogue that was never meant to be heard on a first playthrough.
Bungie embedded what they called ‘lonely NPCs’ throughout several Halo 2 levels — Grunts and Elites who carry on conversations with each other when not in combat, discussing theology, the Great Journey, their feelings about the Prophets, and the Flood. These conversations require standing in specific locations without alerting the NPCs, which in most combat scenarios is impossible.
The Prophet of Truth’s private communications — intercepted by the player if they sit completely still in one sequence instead of progressing — reveal that the Great Journey was never intended to include the Elites. Truth knew the Halos were weapons from the beginning. The Arbiter’s disillusionment has its seeds in information the player could have heard before him if they paused where the game expected them to run.
Bungie’s sound team confirmed in a developer commentary that roughly 40% of Halo 2’s recorded dialogue never plays under normal gameplay conditions — it exists for players who explore movement patterns outside the critical path.

This is the kind of discovery that keeps communities alive for years. Well documented.
Really fascinating breakdown — I had no idea this was hidden in plain sight the whole time. Going back for another playthrough immediately.