Debuff Immunity

Spell immunity (formerly known as magic immunity) prevents heroes from being affected by most abilities, and is used to prevent harmful spell effects, although it also prevents and dispels most positive buffs as well.

It is an aspect of some hero abilities as well as. Many ultimates and certain specific abilities (including all abilities that deal physical damage) have the bonus of piercing spell immunity.

Effects of spell immunity
A unit under the spell immunity buff can not be targeted and will not be affected by most abilities. Some abilities, particularly those that deal physical damage and ultimates, pierce spell immunity and still has an effect.

Regular right-click attacks are unaffected by spell immunity, as are most attack modifiers such as critical strike. The stun from some Bash abilities pierce spell immunity. Similarly, the mana burning effect from Diffusal Blade or also does not work, nor does  from Broodmother.

Spell immunity can be used to dodge incoming projectile-based abilities such as, effectively wasting their usage.

Gaining spell immunity
Heroes can gain temporary spell immunity from several sources. In addition, certain higher level neutral creeps are permanently spell immune. Roshan is not spell immune, but will block some abilities in a manner similar to.

Creeps with spell immunity








Ultimates that do not pierce spell immunity
Most ultimates pierce, Exceptions to this rule can be seen below.

* The tether will still be applied and may still be triggered after the spell immunity ceases