The Grey Valen

The Grey Valen are a highly elite mercenary force, dedicated to taking on and hunting down powerful spellcasters that most other forces would be unable to stand against. They spend most of their time training and keeping their base secure, hidden away from those that would do them harm.
For a mercenary group, their service are not particularly well advertised. Instead, they keep tabs on the world from seclusion, sending out agents to contact the rich and power that they believe may have need of their services. And the fees they charge make up for the sparsity of their work.
Using special tactics, gear, and training, the members of the Grey Valen are uniquely able to resist or avoid the effects of spells, allowing them to close the distance on and take out even the most powerful of spellcasters, where even an army might otherwise fail. Massive fireballs or even cataclysmic events conjured up by the most powerful of spellcasters, powers that could level armies or even cities, can be withstood by the most elite of the Grey Valen.
Their armor improves their resistances, and special training techniques allow them to dodge incoming lightning or fire, ward off mental effects, and power through drains of strength or power on an unprecedented level. Combined with long-range gear meant to bind or silence and prevent casters from getting off more than a spell or two, and blades that can drain away the magic from their targets, these mercenaries are highly efficient at what they do.
Even with all of these skills and protections however, they aren't impervious. Their intense combat training certainly allows them to hold their own against skilled martial combatants, but as their entire skill set and gear are focused around taking out magical targets, they can struggle more than some might imagine with large enough forces of more mundane foes, provided those foes are themselves skilled combatants.
And even against magic, their skill and gear has its limits. Enough spellcasters working together quite pose quite a threat to the relatively small mercenary force, which is why they go through such length to keep their hideout hidden, particularly from magical scrying.

Type

Special Forces