I'm thinking for Necros's Final form, when you kill his second form, his body falls into the well (it's a big one, people), the seconds later, a huge serpent made of shadow emerges from the well. It chases Link through the town, and during this time, there's no may to damage it. It chases you out the main gate, into Hyrule field, where the final batte takes place. The serpent starts flying around, like Volvaiga, launching dark spells at you and breathing fire as it swoops by. In order to defeat it, you must shoot it's weak points with light arrows(each time you do this, the weakspots emerge again, the next time with more to hit) when you knock it to the ground, you simply have to slice it with your sword as much as possible.

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