Das stimmt nicht ganz. Der Schaden, der beim Hauptziel ankommt wird mit dem Cleavefaktor multipliziert und als puren Schaden auf die nahen Gegner verteilt. Hat der Cleaveheld nen Deso erhöht sich also der Schaden unabhängig von der Rüstung der umliegenden Einheiten, da man am Hauptziel deutlich mehr Schaden macht. Wenn das Hauptziel extrem wenig Rüstung hat wird der Effekt noch stärker.

Damage Information:
The damage type of Cleave follows the attack type of the unit wielding it, it is not reduced by armor values but by armor type. A hero's Cleave deals hero damage, which means that it is not reduced by any armor type except for Fortified armor, the only units with that armor type which can be hit by Cleave are the siege units. It is not reduced by spell resistance either and cannot be blocked with magic immunity.

You will only Cleave damage which is included in your regular attack damage (Base damage, damage added from stats and damage from pure bonuses coming from items), this means that skills such as Feast and Desolate, will not add to your Cleave damage.

The main target you are hitting is not affected by Cleave, nor does the main target's armor value or armor type affect the amount of Cleave damage dealt. However, if the attacking unit misses main target then no Cleave damage will be dealt, the Cleave damage itself can however not be evaded.

This basically means that if you have 100 damage and 100% Cleave and are hitting a target with 50% armor reduction the main target will only take 50 damage while all other units, which don't have the fortified armor type, will take 100 damage regardless of their armor. If for an example Omniknight would use Guardian Angel the targets of Cleave would still take 100 damage even though they have +1000 armor.