Necron Immortal

Immortal 2634# of Phalanx 0110, loves caring for Bo-trees, chai tea and breaking the spines of meatbags.

Immortals are the Necrons' shock troops, deployed where regular Necron Warriors are insufficient. They used to be the soldiers of the Necrontyr Empire, and generally consented to the bio-transference process -- after all, an immortal living-metal body is a pretty big step up from a short-lived cancer-riddled sack of meat. While the soldiers were not nobles, they did have knowledge and experience that was valuable in the coming war with the Old Ones, so they were given bodies with better armor and superior weapons. They even retain some of their personality, and are capable of some conversation, though it is basically limited to matters of battle and their voices are completely devoid of emotion (Which is very annoying for the more hammy Lords who try to rile them up with inspiring speeches). They're a bit like the Cybermen from Doctor Who in some ways (which may not be a coincidence, given how prominent Doctor Who is in British popular culture). In 7th edition codex it is shown they do remember much of themselves but thanks to programs only feel rage and pride as a short story of one shows him taking the time to slowly crushing a human skull for damaging his leg for a few seconds rather than a quick death.

For all that lore, the only difference between Immortals and Warriors on the tabletop is that Immortals are slightly more expensive and get better weapons (gauss blasters or tesla carbines vs. gauss flayers) and a better armor save (3+ vs. 4+). In the old Codex, Immortals were Elites rather than Troops, and had better Toughness (as both had 3+ armor saves), but that changed with the new Codex.