The swing

Basic attack: the default swing a unit makes on its beat, scaled off its power. It strikes a random foe in the enemy front row, moving to the back row once the front row has fallen.
Special: a unit's signature skill, cast automatically the moment its Menos reaches 1764, then Menos resets to 0. Its Menos bar and frame edge pulse once it reaches 1764, until the special fires.
Menos regen: how fast a unit's Menos refills, per second, every beat. Each hero has their own rate.

Order and rows

Acting order: positions act in fixed order 1, 2 (front) then 3, 4, 5 (back), every round, on both sides. A position spends its beat even if it is empty or its unit has fallen.
Front / Back: the front pair act early each round with little Menos banked, so they usually swing basics. The back three act later with more Menos, so they often cast first.

Rolls

Crit: a lucky hit for extra damage. Crit chance and crit damage are per hero, read from the stats sheet (a plain hero sits near 16% for 150% damage) and raised by the Constellations, gear and relics.
Evade: the target slips the attack entirely and takes nothing. The blow is dodged by however far the target's evasion stands above the striker's accuracy, and never more than 70% of the time.
Accuracy: your aim, and the only answer to evasion. It cancels evasion point for point, so out-aim a target and you never miss it. Every unit begins at 8 accuracy and 8 evasion, and both are earned: accuracy from jewellery (its second stat), the Constellations and certain beasts; evasion from boots (its first), the same stars and beasts of its own.
Block: the target catches the blow and takes only 55% of the damage.

Control

Hush: holds a unit off its special for about 5 seconds. It keeps the Menos it has already gathered and keeps swinging basics, and the moment the hush lifts it casts.
Drain: rips Menos straight out of a unit's bar. A drained unit keeps swinging, but its special slides further away.
Stun: stalls a unit for about 5 seconds, costing it its next turn; the beat itself is still spent. A held unit banks no Menos.
Other names: a kit may print its own word for one of these. Bewilder and Omen are Hush; Freeze, Petrify, Bind, Ruse and Thread-Snare are Stun. The name on the field changes, the effect does not.

Every control roll is a printed % in the caster's kit, rolled separately for each unit struck. Enemy heroes fight with the same kits you do, so all of this works the same way when it is aimed at your line.