Do units die at 0 Might?

No, units do not automatically die when their Might reaches 0 or lower.

According to Rule 142.2.a, a unit is only killed if it has "nonzero damage marked on it equalling or exceeding its Might." Because 0 is not considered a valid amount of damage in Riftbound, a unit with 0 Might requires at least 1 damage to be marked on it to die.

Key details regarding 0 Might units:

• Survival: A unit can remain on the board indefinitely with 0 Might as long as it has no damage markers.
• Lethal Damage: If a unit has 0 Might, any amount of damage (minimum 1) is considered lethal.
• Negative Might: If an effect reduces a unit's Might below 0, it is treated as 0 for all interactive purposes (Rule 142.2.b), but the negative value is maintained for further calculations (e.g., if a -2 Might unit receives a +1 Might buff, it is still at -1, which is treated as 0).
• Combat: If a 0 Might unit attacks another 0 Might unit, neither deals damage to the other, and both survive the exchange.

Summary of the Sequence:

1. A unit's Might is reduced to 0.
2. The unit stays on the board.
3. If the unit takes 1 or more damage, it is checked against its Might (0).
4. Since 1 is greater than or equal to 0, the unit is then killed during the next cleanup.