Sell the tome for cold, hard cash.
If you've capped Preservation, then you're in the right area to cap SLW and Rit Lord.
Personally, I wouldn't use either SLW nor Preservation - Preservation sucks, period, and SLW is essentially an elite Healing Breeze. Heal-over-times are bad in GW, as a rule of thumb. And SLW stops you from having a more useful Weapon spell on - Splinter Weapon (... which you're using, right?) which kills shizzle; or Weapon of Shadow/Warding which stops stuff dying.
Better yet - assuming Factions only - would be Attuned Was Songkai or Signet of Spirits if you really must take a Rit elite; or Expel Hexes or Empathic Removal if you really don't care.
Hard truth about Rits - most of their elites suck.
[skill]signet of spirits[/skill][skill]attuned was songkai[/skill][skill]expel hexes[/skill][skill]empathic removal[/skill]
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