I read that Celestia in the offhand will apply some of it's effects to your main hand (radiance, greater sunburst, and/or fiery detonation). I'm not sure which ones will apply and which don't, but it got me wondering what other weapons make good offhand weapons when using a thrown weapon in your main hand. Is there a list of effects somewhere that apply to all weapons regardless of its source? I know things like doubleshot and destruction work that way, but I don't know them all.