Chaos Caves
The Caves
"Outdoor Caves" or "Chaos Caves" can be found around the canyon region. They are one of the richest sources of experience in the Neocron world.
Monsters
Inside the cave you will find Chaos Creepers, Minions, Soldiers, Lieutenants, Vampires and Queens. However, there is no queen in the cave outside Canyon Facility. Their levels vary from 70/70 to 100/100 (Queen is 120/120). They have moderate HP, are fire resistant and deal direct Poison/Piercing damage. No tech parts drop here, mostly just recycleable junk, except for the Queen.
Gearing Up
You might want to worry about your poison resist here. Poison Belts, Poison Resist skill and Hazard Booster buffs help here. Being able to eguip a Viper King armour is a plus. For Monks and Spies, piercing resist can also be an issue, especially with the lower hp they have.