Material component

Material components are one or more physical substances or objects that are annihilated by the spell energies in the casting process. In DDO, all the spells of the same level and class which require a material component use the same item. Those items are sold by reagent vendors around Stormreach. They stack together, so a typical spellcaster will keep hundreds of components at hand for each of the spell levels he can cast.

Some spells require special or different components, they are;
 * Create Undead requires a Black Onyx (this is a purchased component, not a randomly-occurring gem)
 * Death Pact requires a Large Diamond (ditto)
 * Flame Arrow requires a arrow
 * Holy Sword requires a blessed cold iron weapon
 * Stoneskin requires Granite and Diamond Dust (10 for 2500gp)
 * Tenser's Transformation requires a Potion of Bull's Strength
 * Trap the Soul requires khyber dragonshards