Debuff Immunity



Spell immunity (formerly known as magic immunity) is a modifier which prevents most spells to target the affected unit. This includes single-targeted, area of effect, passive and active abilities.

Spell immunity may be the main part of a spell, but it also is used as an extra layer of protection by some abilities (usually combined with invulnerability).

Mechanics
Spell immunity is a status effect (also known as modifier). Most abilities in the game first check whether or not the unit has the spell immunity modifier on. If the modifier is present, single target abilities cannot target the unit at all, while area of effect abilities ignore the unit and already ongoing effects may stop affecting it. However, some abilities (and most ultimates) pierce spell immunity and can fully target and affect spell immune units.

Usually, a spell either fully pierces spell immunity, or it is fully blocked. However, there are a few exceptions to this rule. Whether or not a spell pierces spell immunity is noted down in the description boxes of each ability, right below the ability name.

When a unit turns spell immune while a projectile from an ability is already flying towards it, the projectile has no effect upon impact if the spell it originates from does not pierce spell immunity. The same applies to most, but not all delayed effects.

Spell immunity does not prevent regular attacks of any units. However, some attack modifiers do get blocked, but not all of them. Generally, all critical strikes, cleaves and most bashes pierce spell immunity.

Dispel
Most sources of spell immunity apply a basic dispel on the targeted, removing all buffs or debuffs. Only a handful of sources apply strong dispel.

Since dispels only remove buffs from enemies and debuffs from allies, it is possible for units to turn spell immune without losing any buffs or debuffs. Spell immunity cannot be applied to enemies, most buffs or debuffs in this case still apply their effects normally. Only a few of them are inactive while the unit is spell immune. This means that a damage-over-time ability may still damage the unit.

This was tested with 's before the pre-7.00 when it was able to target enemies.

Basic Dispel
Spell immunity may also apply a basic dispel, although not all of them do. Their dispel does not differ from that of basic dispels, in fact, they use the exact same mechanic.

Strong Dispel
Only a few sources provides spell immunity with a strong dispel.

Without Dispel
The following sources provides spell immunity and does not apply any form of dispel.

Spell immunity on allies
Every not-targeted spell, be it an area spell or a spell which affects self upon cast, pierces spell immunity for allies and self, with a very few exceptions listed below. All runes apply their effect on spell immune units.

Spell immunity on enemies
Spells interact very differently when facing spell immune enemies. Most of them cannot affect spell immune units, some of them can only affect them partially, and some fully pierce spell immunity.

Imunidade a magias Невосприимчивость к магии 技能免疫