Not every class can get the cloak. The in-game information in this article is kept purely for historical purposes and may not need to remain under any other categories. In PvE, where only few mobs have resistances, especially with Curse of Elements active, spell penetration's value is situational at best.
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Due to its implementation, it is primarily a PvP-oriented stat. Spell penetration reduces the target's resistance to your spells; it is a different mechanic from spell hit rating.