Warlocks and Sentinels of Bharri

[Jeargroth]

Alrighty, more aid requested from my fellow gamers. I am looking at the Warlock Hand book and Sentinel of Bharri is listed as a decent Prestige Class. Now I see it advances spell casting which is fine, but as far as I can see it doesn't affect Eldritch Blast damage. You would be stuck with the 3-4d6 damage. Are people looking at just foregoing the blast and going utility for the invitations or am I reading it wrong and the levels stack for Eldritch blast as well?

Thanks again... This is all fodder for villains (heroes) to do a second part of a plane hopping Campaign.

Jeargroth

[The Viscount]

As page 18 of Complete Arcane explains, when warlock enters a PrC that advances casting, the levels stack for caster level, invocations known, and eldritch blast damage.