Infiltrator

Infiltrators are the Vanguard Primaris line infantry unit. They are geared for extended recon and stealth operations behind enemy lines, with precision boltguns, smoke grenades, omni-scramblers and the ability to take lite-Apothecaries in the form of Helix Adepts.

Equipment

Infiltrators are all clad in Phobos-pattern armour that is stripped down for lighter weight and modified with silent servos. Their backpacks are adorned with a variety of antennae and they go into battle similarly equipped to other space marines. Most notably, their bolt carbines have special optics that enhance their accuracy, they have smoke grenades in addition to the standard frag and krak grenades and omni-scramblers which can disrupt any kind of deep strike attack.

Tabletop

If Infiltrators are costed similarly to other Primaris marines, they may be one of the most disgustingly good Primaris units to exist. As Troops, they have ObSec. They can deep strike. They project a bubble forcing enemies that are set up as reinforcements to do so over 12" away, making standard deep strike charges completely impossible. Note that 'setting up as reinforcements' does not include abilities that move units across the map, like Da Jump. Their smoke grenades give the unit a -1 to Hit for a whole turn if the enemy fires ranged weapons at them at the expense of their shooting. This adds to their already high durability as 2W marines with a 3+ save. The option exists to add a Helix Adept, which is a combat medic for the squad. The Helix Adept has a weaker version of the Apothecary's narthecium, which lets it restore 1 wound per round to models in its unit, or revive a slain model in its unit on a 5+.

Their boltguns are also fancy. They have a standard boltgun profile, but all unmodified To Hit rolls of 6 instantly hit and wound, letting you skip wounding entirely against enemies and grants a 1 in 6 chance of automatically wounding ANYTHING in the game from ork boyz to titans.

In short: They are highly durable ObSec troops with solid killing power, deep strike and the ability to make enemy deep strikers around them totally unable to charge and deploy further than 12" away. They are a new gold standard for objective holding troops and with deep strike and their magic guns, they have utility outside of that role.