Well, I know the Daystar is only enchanted +2, therefore it can't hit the demi-lich, since the demi-lich needs +4 enchanted weapons to hit it.
Flail of ages does have a major advantage in that it automatically slows any opponet it hits. Period. No saving throw, just if it wacks you, your moving and casting and meeling at half your normal speed. That means you will get hit for less, and can beat on that critter for more.
I think the main reason people don't like to use it, is that they don't have a character that has developed the flail fighting ability. You develope a character with some good points into flail profeciency, and you have a seriours damage dealer for your party. Also, the elemental damage points will go threw mages stone-skin spells. For a really nice combo, a bezerker/cleric duel-class human, with duel-weld maxed, war hammer and flail/morningstar profs developed, can really put a hurting on things.
For spears I like to develope Jaheria with either the Impaler or the Withering spear (that +4 enchantment +4/4 THACO/Dam and +4 posion, and the posion is nasty) or go the staff route. Staff of Striking, Rynn, and Woodlands are some of my favorites for her.
Personal favorites are axes and longswords.
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Drink and be merry
Jimbo
"Renegade, Rebel, and Rogue"