I thoroughly enjoyed this adventure on the second run through. The first time I ran it solo with a Lawful Evil Monk/Stone Sorceress/Hexblade Warlock and in the end basically ended up destroying the Longsword as it was Sentient Chaotic Good.
I modified it for the next run solo with a Lawful Evil Monk and a Sentient Lawful Evil Longsword with Telepathy that reached out to every Lawful Evil creature at an extended range, summoning them. It had intended for them to battle each other until the sole survivor earned to the sword.
This came off as a much better adventure... very satisfying!!!
[5 of 5 Stars!]