You learn how to make your weapon strikes undercut a creature's ability to withstand your spells. When you hit a creature with an attack using a weapon, that creature has Disadvantage on the next saving throw it makes against a spell you cast before the end of your next turn.
Eldritch Strike
Raw data
{
"name": "Eldritch Strike",
"page": 98,
"level": 10,
"__prop": "subclassFeature",
"header": 2,
"source": "XPHB",
"entries": [
"You learn how to make your weapon strikes undercut a creature's ability to withstand your spells. When you hit a creature with an attack using a weapon, that creature has {@variantrule Disadvantage|XPHB} on the next saving throw it makes against a spell you cast before the end of your next turn."
],
"className": "Fighter",
"classSource": "XPHB",
"subclassSource": "XPHB",
"subclassShortName": "Eldritch Knight"
}