Staggered
A staggered creature is hesitant, slow to take action, or unable to act normally.
Stage 1: A staggered creature cannot take free actions or reactions, though they can use an action during their turn to do something that would normally be a free action or reaction.
Stage 2 (nauseated): As stage 1 but they are limited to only 2 actions during their turn.
Stage 3 (dazed): As stage 1 but they are limited to only 1 action during their turn.
Stage 4 (stunned): As stage 1 but they cannot take any actions at all. Upon becoming stunned, a creature releases everything they are holding, ceases concentrating, and falls prone. Some effects "stun" a creature "until the start of the target's next turn", essentially only causing them to drop what they're holding and be unable to act until their next turn.