Weapon, armor, magic, and crosshair restrictions.
All combat is available, but your skill set should be focused as these gates mean you may be limited from some gameplay on that character.
Damage and combat on Aurbis mirror vanilla with a few specific rates for balancing purposes.
Some skill trees will only be available via the correct Birthsign.
There are Major and Minor gates on certain equipment, weapons, and combat skills that restrict or limit your usage until either (1) Grinding the Skill Level or (2) Selecting the correct Birthsign.
Archery only restricts the crosshair until Skill Level 10.
Major gate restrictions are Skill Level 20, and Minor gates are Skill Level 10.
Major skill gates: Heavy Armor, Two-Handed, One-Handed (Dual-Wielding).
Minor skill gates: Alteration, Conjuration, Destruction, Illusion, Restoration, Block (Shields), Archery (Crosshair Restriction).
SEE MORE ON Major and Minor Skill Level Grants