The Lord of the Rings
The hobbits come to Mount Doom, where they are attacked by Gollum, who still wants the One Ring. Frodo goes on alone into Mount Doom, but Sam has pity for Gollum and lets him live. Sam follows Frodo into Mount Doom. Frodo is finally overpowered by the One Ring, says it belongs to him and puts the Ring on, which makes Sauron know that he and the Ring are there. Gollum comes back once more and fights with Frodo. Gollum bites off Frodo's finger with the Ring. Gollum is happy to have his Ring back, but makes a mistake: Gollum and the One Ring fall into the volcano, and the Ring is destroyed. Sauron fully dies and his fortress Barad-dûr is destroyed.