Where are the Celestial Fury and the Holy Avenger? Also, where is the third head for the Flail of Ages? I have the one from the golems and the one from the room near the smithy, but have no idea where the other one is.

Celestial Fury is foun in the Temple area in the guarded house or something its called, north of the Radiant heart.

The third flail head is by the forge behind alot of hidden doors, to the left after entering through the secret entrance.

SPOILER
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The Celestial Fury is in the Guarded Compound on the east side of the Temple district.... you can't see the door, so you have to move your cursor over it to find it.... it's close to one of the entrances to the sewers.

The Holy Avenger is found after killing Big Red Retard (Firkraag).

Can't remember where the third flailhead is. Should be somewhere on the ground floor I think..... not sure though.

There's a secret door in Lord de'Arnise's bedroom. Follow it to get to a storeroom. There's another secret door in the storeroom, behind which is a little loungeroom with a knight in it. The knight's insane and will attack you. Kill him and get the third flail head.