Massive Damage; System Shock

Source: Dungeon Master’s Guide p. 273

System Shock

dice: d10	Effect
1	The creature drops to 0 hit points.
2-3	The creature drops to 0 hit points but is stable.
4-5	The creature is stunned until the end of its next turn.
6-7	The creature can’t take reactions and has disadvantage on attack rolls and ability checks until the end of its next turn.
8-10	The creature can’t take reactions until the end of its next turn.
^system-shock