Armara

Armara (Defence [sic]) is a constellation added by Astral Sorcery. It is associated with increasing defensive power or repulsion. It is a bright constellation that can be found in the night sky when the moon is between and including a waning gibbous to waxing crescent.

Stellar Refraction Table
This constellation bestows Protection on Books and armor and Resistance on potions.

Ritual
This constellation constantly pushes mobs (excludes players) away from the Pedestal. It will repel enemy projectiles like Skeleton Arrows.

Mantle of Stars
This constellation will completely block an attack inflicted upon the player. By default the Mantle can block 3 attacks and recharge one stack every 80 ticks (or 4 seconds). This can be changed in the mod's config file.