Can a unit's might be reduced to 0 or negative values, and when does a unit with 0 or negative might die?

Ruling: A unit's might can be reduced to 0 or negative values. Units with negative might are treated as 0 might for interactive purposes (like dealing damage), but remain negative for calculation purposes. A unit with 0 or negative might only dies when it takes damage (non-zero lethal damage), not from having 0 might alone.

Sequence:

• Might can be reduced below 1 (to 0 or negative)
• Negative might is treated as 0 when referenced for effects (like dealing damage in combat)
• Negative might remains negative for calculations (like further reductions or increases)
• Unit dies only when it has both 0 or negative might AND has taken damage

Nuances:

• Challenge causes a -2 might unit to deal 0 damage (treated as 0 for interaction)
• Discipline leaves a -2 might unit at 0 might, not +2 might (the negative value matters for calculations)
• Origins cards often said "to a minimum of 1" as a preemptive measure to prevent confusion, but this wording was removed in Set 2
• 0 might alone is never a lethal condition; the unit must also have nonzero damage to die