How about orbs are held in shield slot, they give a moderate magic offense and defense boost, but negative against melee, seeing as if it gets hit by a massive hammer it may shatter etc. To make up for this maybe somethign like Mind Orbs, Body Orbs, Chaos Orbs, Death Orbs, Blood Orbs and Soul Orbs. Each give a 15% chance fo supplying the said rune, they can be crafted at RC Altars if you have the RC Level to make the corresponding rune. The uncharged orbs are dropped by the Shades in the SoS (yeah random, they give low exp so no massive exp gains there). EDIT: Soul Orbs are made randomly at the ZMI, so if you bring an inventory of Uncharged Orbs, you may get all Minds, all Bodies or half Minds, half Bloods. Soul Orbs are 1/50 chance of crafting at ZMI.