Warning, the term useless is in quotations for a reason, considering that it is hard to say that a spell has absolutely no value. Some people might view certain skills differently and they may have more value to some than others, but here is my very subjective list of the five most useless spells in Dota 2.

5. Insatiable Hunger - Broodmother

When fully upgraded, this skill can be useful for a source of sustain, but what is the point of dumping experience points into a skill that won't be meaningful until much later?

It is hard to justify spending an upgrade on Insatiable Hunger when Spawn Spiderling can be so powerful.

4. Penitence - Chen

When it comes to slows, there are far more useful and stronger skills than Chen's Penitence. The "damage amplification" it provides is a joke.

During a team fight it can be slightly helpful, but there are far better abilities.

3. Null Field - Rubick

Rubick is a great versatile hero, but his ability, Null Field, is almost a waste of an ability and mana.

With the right player and the right situation, the ability can be useful, but the magic resistence received from Null Field just isn't strong enough to make too much of a difference.

2. Darkness - Night Stalker

Darkness allows for Night Stalker to have a burst but it doesn't do much for his team, or even much to stop the enemy.

If anything, Darkness is a minor inconvenience that will cause inexperienced players to panic.

1. Rot - Pudge

Yeah we get it, Rot is a good crowd control ability but using it is literally the equivalent to killing yourself.

I wouldn't recommend using this in a team fight, or in a solo fight, or at all really.

Pudge has other abilities worth investing in, so do yourself, and your team a favor and skip out on Rot.