» THE SIGHT & NEPHILIM PHYSIOLOGY
The Sight allows those with angel blood to see what normal humans cannot, such as demons and other creatures from the Shadow World. The sight can be fooled, but can see through glamours and illusions, identifying vampires, werewolves, and demons, as well as certain disturbances (presence of magic, portals, ichor). Being part angel, Alec is stronger, faster and has more endurance than a regular human.
» ANGELIC POWER & RUNES
Alec can mark his body with angelic runes with the help of a stele
. The marks fade with time and must be reapplied, while some are permanent and can be activated. These runes have varied effects that go from creating heat, quieting sound, making the user invisible, tracking, night vision and improving existent abilities (strength, balance, aim) to providing nourishment. A list of available runes can be found here
. Angelic power affects angelic weapons as well, and Alec's preferred weapon is a bow, although he knows how to use a variety of blades and hand to hand as well.
» PARABATAI BOND
Alec's soul is linked to Jace's through a parabatai bond, which allows two warriors to draw strength and power from one another. Any runes drawn between parabatai will have a stronger and more lasting effect, and the two work in total tandem, like two halves of one, in battle. When they fight together, they are twice as powerful as when they fight alone.
Magnus' incentive while in Eudio was to earn Alec's protection so that he could only die of old age. Alec can still be injured, but none of these injuries will lead to his death. After Alec has earned immortality as his incentive in Eudio, which means he has effectively stopped aging as of his arrival in Xistentia.