A post-apocalyptic London has been overrun by hordes of terrifying demons, leaving the city desolate and scorched by hellfire. Those who were unlucky enough to survive now gather in the only sanctuary left, the Underground, banding together in order to gain a foothold against the minions of darkness and ultimately save the bloodline of humanity.
It is no surprise that these sole survivors come from three of society’s most elite factions, each of whom are masters of a robust number of skills and weapons essential to demon-thrashing.
The Templar, a secret society preserving the rites of the original Knights Templar, mix futuristic technology with ancient artifacts to create powerful weapons and armor perfect for short-ranged and melee attacks.
Apparently, those "ancient artifacts" include lots of all-seeing eyes and Masonic squares and compasses.
And for the esoterics in the audience:
The Cabalists are students of the dark arts and edges of science which often leaves them standing right on the line between good and evil. Their mystifying spells make them suited for mid-range combat.