Ensnaring Strike
As you hit the target, grasping vines appear on it, and it makes a Strength saving throw. A Large or larger creature has Advantage on this save. On a failed save, the target has the Restrained condition until the spell ends. On a successful save, the vines shrivel away, and the spell ends.
While Restrained, the target takes 1d6 Piercing damage at the start of each of its turns. The target or a creature within reach of it can take an action to make a Strength (Athletics) check against your spell save DC. On a success, the spell ends.
Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 1.
Ensnaring Strike 5.5e 2024 vs. 5e 2014 edition differences
The 2024 version states the target makes a Strength saving throw, while the 2014 version states the target must succeed on a Strength saving throw or be restrained. The 2024 version explicitly states the target or a creature within reach can take an action to end the spell, whereas the 2014 version states a creature touching it can use an action. The damage increase wording is simplified, but mechanically similar.