Counter-item to tank-heavy compositions. Build it when enemies have 3+ tanky heroes or when the enemy tank has 100+ armor. The percentage penetration scales with how much armor they build — the more defensive they go, the more valuable this becomes.

Best on

Marksmen, Assassins — physical carries who fight frontliners.

Consider instead

Blade of Despair

Endless Battle

Heroes that build Malefic Roar

Core1 hero

Saber

Assassin · Jungle