I just had an odd though sparked by the recent gremlin invasion.

Some invasion creatures should be appeasable.

For example, gremlins invade, you give them a crafted item, they destroy it then vanish (fufilling their roles as the bane of crafters).
Goblins invade, throw money or gems at them, they run off, having gotten their loot.

Depending on the critter and method, it would be an interesting way for younger characters to help "fight" an invasion.

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Weapons for Sale:
http://www.elanthipedia.org/wiki/User:Caraamon#Wares
Hunta Talna Kortok, built by Gor'Togs, for Gor'Togs
http://www.angelfire.com/rpg2/caraamon/home.html
Combat Balance List:
http://tinyurl.com/DRBalance