The Hex 5e spell is a personal damage booster to a single target. Anytime a character has the opportunity to increase their damage per attack, it is a good thing.
Hex is a bonus action to cast. This means you can cast Hex on a target and then take the attack action or cast a spell that is a cantrip in the same turn.
Hex 5e
Casting Time: 1 bonus action
Range: 90 feet
Components: V, S, M (the petrified eye of a newt)
Duration: Concentration, up to 1 hour
You place a curse on a creature that you can see within range. Until the spell ends, you deal an extra 1d6 necrotic damage to the target whenever you hit it with an attack.
Also, choose one ability when you cast the spell. The target has a disadvantage on ability checks made with the chosen ability.
If the target drops to 0 hit points before this spell ends, you can use a bonus action on a subsequent turn of yours to curse a new creature.
A remove curse cast on the target ends this spell early.
At Higher Levels:
When you cast this spell using a spell slot of 3rd level and 4th level, you can maintain your concentration on the spell for up to 8 hours.
When you use a Spell slot of 5th level or higher, you can maintain your concentration on the spell for up to 24 hours.