Adepta Sororitas Battle Sisters are zealous servants of the Emperor. They charge into battle armed with Bolters and Heavy Flamers that ignore cover, purging heretics and xenos with extreme predudice.
An Inquisitor Hereticus shows no mercy as he cuts down enemies of the the Emperor with his Power Weapon. He leads and inspires his troops in battle, and an Invulnerable Save gives him extra staying power.
Necron Obelisks are heavily armoured vehicles that have good anti-infantry and anti-armour capability. They can appear anywhere on the board without warning, to cause havoc among enemy ranks.
Dark Eldar Warriors are similar in cabability to their Craftworld Eldar counterparts. They do have a ranged attack in the form of a Splinter Cannon, albeit extremely short range.