Earth is a world without magic, or if you want to get technical it has a Mana Density of less than 0.014, making even the most basic of spells take centuries to recover from, if one can even exist for that long.  Earth is ignored on the Cosmic scale becaue of its relative uselessness without Mana.  Unless you have Cadium.  The most precious resource in existence where even one unit grants the wielder the ability to generate their own personal mana.    Out in the Cosmos hundreds of Mana rich worlds exist with wielders of incomprehensible magic fighting and killing for such power.  It is said there are those that exist with as many as forty Cadium, but those are myths few believe.  Even the richest beings holding court over an entire planet would only be able to afford ten or twelve at most.   Huge factory planets employ billions of beings to create Seekers, magic probes of interconnected runes whose only purpose is to seek out and find sources of Cadium making Kings from paupers overnight.  Beings would slaughter billions at just the rumor of one or two Cadium.  Only the most trusted lieutenants are gifted a single Cadium to subjugate and dominate the masses with overwhelming power.   Of the Trillions and Trillions of beings in the known universe only a few thousand are known to have such power, where hundreds have more than one, and only a dozen have more than five due to the multiplicative power Cadium has over the magic.  Five beings with twenty Cadium rule from a counsel with an Iron fist crushing all who oppose them.  Each of the five trust no one, as there are two ways to gain Cadium.  Find it first, or slaughter a wielder and claim it for yourself.