The tower cycles between Night and Day stacks gained from abilities. Day increases the tower's critical attack damage by 0.001x per stack and Night increases the tower's attack speed by 0.1% per stack.
Eclipse
Critical attacks and kills grant the tower 2.0 seconds of Eclipse. While Eclipse is active, the tower gains 1 Day and 1 Night per second and both Starfall and Solar Flare are simultaneously active. Duration accumulates.
Solar Flare
During day time, attack hits have a [0.1%xNight] chance to fire bolts at every enemy within attack range, dealing 50% of attack damage as Elemental damage. Converts 1 Night into 1 Day for each bolt fired.
Level Bonus: +0.2% damage
Starfall
During night time, a star will fall onto a random enemy within attack range every second, dealing [1%xDay] of attack damage as Energy damage to the target. Converts 1 Day into 1 Night.
Circadian Attunement 
Eclipse 
Solar Flare 
Starfall