Bow: Depends on what you mean by "finale". There's one bow that you can get as part of the leadup to the finale of the main quest; you'll know it when you see it. I don't consider this part the "finale" because (minor spoiler)
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- you get another chance to wander the world afterwards and there are still a few hours of main quest left.
Narratively speaking, it could be considered part of the finale, though.
After that, the Chaos Bow is the best. This is indeed found in the Southrealm, in
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- The Mana Catalyst - Upper Level. Please note that the lower and upper levels are mislabeled on the world map. (Or rather, correctly labeled, while the dungeons themselves are mislabeled: the lower one is the Upper Level, the higher one is the Lower Level.)
1H Blunt: the Aeterna Axe. I personally prefer the Skull Crusher because, although it's weaker, it has more reach (which is important given how many enemies knock you back when they hit), and although you can't enchant it yourself, it has a pretty handy enchantment on it. (Incidentally, the best two-handed blunt weapons are almost twice as strong as the best one-handed blunt weapons.)