The staff's smooth and glossy, almost reflective truesilver surface was long ago tarnished by the corrupting powers Kalrum wields. None can see their reflection as veins of felfire crack along the staff's length, giving it an almost living appearance as they pulse with power.
What was spared was the intended handle, whose leather decayed and was since replaced by a covering of felhide. Similarly, the top and bottom of the staff were also spared for the most part, the bottom is capped by a single red crystal that despite it's coloring, radiates a green energy. Along the brace holding the crystal to the staff are inscribed many runic sigils that despite the corruption still thrum with arcane might, a testament to Kalrum's continued mastery of the arcane art of enchanting.
The top part of the staff is much the same as the bottom part, a large band encircles the top of the tainted truesilver, but instead of a whole crystal, the much larger red gem splintered apart and now float around the staff's head. At the very center of the floating crystals is a single orb of a fel infused crystal that doubtless acts as the staffs primary focus.
What the experienced can tell is that this staff was once the weapon of an Archmage. While Kalrum has never held this title himself, it stands to reason he 'found' the item on an archmage, since bolstering the staff's strength and corrupting it to the core he renamed it to Desolation. For the power he pours through it turns his foes and the land to ash, leaving nothing in it's wake but barren desolation. When the crystal broke, the floating pieces reminded Kalrum of the spires of the Firelands, thus he tacted on, "Spire of Annihilation" to his staff's title as to further symbolize it's destructive power.
Regardless, it is an extremely potent weapon infused with fire and fel and enchanted with the arcane. Although said arcane symbols must be constantly refreshed due to the conflict the energy has with the fel that completely infuses the item.
In D&D terms, the item works like a Staff of the Magi, but the spell list is different. And, any spells it casts deal Fel or Fire damage (Kalrum's choice when using the spell).
Additionally, the spell bonus is increased to +3, same with the spell DC's.
Also, any spells Kalrum cast that deals Fel or Fire damage ignore resistance to Fel and Fire, and treat immunity to fel or fire as a special kind of resistance (Immune creatures take half damage instead of none, an effect that completely ignores immunity would also ignore the special resistance.)
This is the ingame staff Kalrum uses.
Just imagine the center piece as a fel orb. The staffs length as truesilver with fel veins. And the central handle being made out of felhide, a reddish material. Oh, and imagine purple arcane symbols carved along the top and bottom of the staff, near the crystals at both ends.