For Tryndamere, Barbarian's ability that triggers on conquering after an attack with 5+ exceeding damage, what sources of damage count toward the 'assigned damage' requirement?

Ruling: Only combat damage assigned during the combat damage step counts toward Tryndamere's exceeding damage requirement. Spell damage does not count, even if cast during combat.

Sequence:

• Spells (like Hidden Blade) resolve before combat damage is assigned
• Combat damage is resolved last
• Tryndamere must be present in the combat and conquer
• You need to damage at least one unit in the combat damage step with at least 5 exceeding damage in that step

Nuances:

• You can use spells to damage units before combat, reducing the amount of combat damage needed to reach 5 exceeding damage
• Direct kill spells like Hidden Blade resolve before combat damage, so they don't contribute to the exceeding damage calculation