Innate Spellcasting. The Acalica's innate spellcasting ability is Charisma (Spell Save DC 12). He can innately cast the following spells, requiring no material components:
At Will: Dancing Lights, Detect Evil and Good, Detect Thoughts, Druidcraft, Invisibility (self only).
Each Spell Once per Day: Confusion, Dispel Magic, Gust of Wind, Phantasmal Force, Sleep, Sleet Storm, Wind Wall.
Each Spell Once per week: Control Weather, Wind Walk.

Glimmer. The Acalica is invisible when looked at directly. It can only be seen out of the corner of the viewer's eye unless the Acalica decides otherwise. Attack rolls against the Acalica have a -1d4 penalty.

Magic Resistance. The Acalica has advantage on saving throws against spells and other magical effects.

Weathervane. The Acalica can predict the weather for the next 24 hours with 100 percent accuracy. Their coloring also reflects the current weather pattern and hints at the forecast as well. For example, on a hot day but with rain the following day, he will appear reddish/orange with blue/green wings and cap.

Sky-Bolt. Ranged Spell Attack: +4 to hit, range 90 ft., one target. Hit: 12 (3d6+2) damage. The Acalica can and must determine the damage type as part of the attack which can be cold, lightning, or thunder. This attack does an additional 7 (2d6) damage if the target could not see the Acalica when the attack hits.

Glimmer Man. When an attack misses the Acalica he may become invisible until the end of his next turn or until he attacks.