Adepta Sororitas Seraphim are elite warriors in a Sisters of Battle army. They have good armour and are effective in both fire fights and close combat. Their wings allow them to move a significant distance across the battlefield, and the Teleport ability allows them to strike from unexpected locations.
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.
The Adepta Sororitas Canoness leads her troops into battle, inspiring them to fight harder in engagements. She is armed with a Blessed Weapon, that makes her a formidable opponent in close combat.
A Necron Pylon is a huge, stationary weapon with impressive range and power. It is unsusual in that its Titan-killing Particle Accelerator can target aircraft, making air assault on the Necron army especially difficult for their enemies.