Dragons that breath fire are weak against ice, and dragons that breath ice are weak against fire. Alduin breathes both though. Is anything "super effective" against him?
Do any weapons do extra damage against the final boss
the-elder-scrolls-v-skyrim
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Best Answer
While one could argue that Dragonrend is "super-effective" against Alduin, the most obvious choice is the unique Blades sword "Dragonbane". Dragonbane can be found in Sky Haven Temple, located on a table off to the left of the main chamber along with a full set of Blades armor and several Blades sword.
Unfortunately, Dragonbane's enchant is unique so you won't be able to enchant it yourself. Like most unique items, Dragonbane is leveled and the power of the enchantment is determined when you encounter it. It can range from 20-40 extra damage against dragons.
Note that Alduin will have a special voice response if you carry Dragonbane in your inventory into your battle with him. Dragonbane merely has to be present in your inventory, not equipped.