Captains
Board tiles are "recruits" waiting to deploy. Line up 3 of the same recruit to form a tier-1 unit (it won't attack yet), then merge further to reach tier 2 and beyond. A captain stays the same person across tiers — face, hair color, and weapon never change. Tap a card for full stats.
Rion Archer / omnidirectional Benched by default The dependable basic unit. Fires in any direction with a fast attack rate, at the cost of a light hit. Place it where enemies pass through often and let volume of fire do the work. 
Seris Spear / mid-line In default roster Strikes only the fixed diagonal-and-vertical spread in front of it. Merging never widens that reach — it just makes each thrust hit harder. 
Mira Cannon / straight line Benched by default Fires straight down her own row. Splash damage around the impact point makes her strong against packs that cross that row. 
Alden Guard / blocker In default roster The only unit that can hold enemies in place directly ahead of it. Toughest of all the units, it keeps trading blows with whatever is adjacent while it blocks the lane. 
Lyra Mage / area In default roster Hits every enemy in range at once. Weak per target, but it only gets more valuable the more crowded a night is. 
Kael Sniper / long range Benched by default Fires the single heaviest shot in the game straight down its own column, piercing every enemy lined up in it. It cannot fire sideways, and its attack interval is the longest of any unit. 
Selene Medic / support In default roster A non-attacking support unit. It continuously heals the units in the four adjacent tiles and boosts the damage they deal. Stack several for a stronger effect.