When you hit with your Sneak Attack on the first round of a combat, the target must succeed on a Constitution saving throw (DC 8 plus your Dexterity modifier and Proficiency Bonus), or the attack's damage is doubled against the target.
Death Strike
Raw data
{
"name": "Death Strike",
"page": 134,
"level": 17,
"__prop": "subclassFeature",
"header": 2,
"source": "XPHB",
"entries": [
"When you hit with your Sneak Attack on the first round of a combat, the target must succeed on a Constitution saving throw ({@dc 8} plus your Dexterity modifier and {@variantrule Proficiency|XPHB|Proficiency Bonus}), or the attack's damage is doubled against the target."
],
"className": "Rogue",
"classSource": "XPHB",
"subclassSource": "XPHB",
"subclassShortName": "Assassin"
}