Summary (of Shadowking bit anyway)
Eclipse (the Shadowking's general) warned Lady Lioness to not allow the erection of a temple over some ruins to the East
A group went to investigate the ruins. They found it full of undead which had gathered around a Negative Energy source. A golem minion oh Huthakan went down there and was held off until the Shadowking (Patron God of Vigilantes) formed from the Negative Energy and splatted it
The Shadowking has arrived at the castle (amidst great suspicion, naturally
) to state he has arisen to fight his own brother, a Demi-God of Fire
Back to the story:
The rain that was summoned starts to turn bad. It becomes rains of fire. Huthakan has meddled with that spell!
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Lord Raptor's Site
Ironworks Dark General
BG2 Tavern Keeper
King of Pointlessness