Within the game, the single-player campaign story is presented via mission briefings, audio dialogue, ships’ logs and psychic vision scenes. Most of the time is spent walking around and beating the bones out of Tyranids though, so if you are after a strong progressing narrative, Space Hulk: Deathwing is NOT for you.
Character upgrades in the single-player campaign are attained by performing certain actions in the game like finding relics, making melee or psychic kills and hacking stuff. At the end of a chapter, you are given fervour points to upgrade your abilities.
In multiplayer and special missions, upgrading is completely different. When you complete or fail missions, experience is awarded. Get enough experience and you level up. Upon levelling up you get renown and a random freebie to upgrade your character. Upgrades can also be bought with the renown you earn.