The zodiacs are what star constellation you were born under. They each have several powers. Here is the list of birthsigns
Mage: +50 magicka
Apprentice: +100 magicka but 100% weakness to it
Warrior: +10 strength and +10 endurance
Thief: +10 Agility +10 speed and +10 luck
Shadow: Invisibility for 5 posts (will deactivate after an action) Once every two threads
Lover: Paralyze on touch for 2 posts. Once every two threads
Ritual: restore 200 health instantly. Turn undead for a magnitude of 100 for 4 posts. Once every two threads
Tower: Open average lock. 5% chance of reflecting damage for 8 posts. Once every two threads
Serpent: four effects all at once. Damage health on touch for 3 damage for 5 posts, 90% chance of dispelling effects on yourself, cure poison, fatigues you. Once every two threads
Atronach: +150 magicka, 50% chance to absorb spell magicka, no magicka regeneration
Lady: +10 willpower +10 endurance
Lord: Restore 6 health for 3 posts Once every two threads. Passive 25% weakness to fire.