Breath of the Wild: Stop a titan of molten stone

Stop a titan of molten stone is one of the Main quests in LoZ:BotW

Travel to Divine Beast Vah Rudania
From there, you will want to start glidng across the caldera of Death Mountain, keeping clear of the Divine Beast.
Travel to the Northeast initially and then head for the Northern lip.
After that, climb out of the caldera and start toward the "Lake Darman" to the Northeast, in the direction of the Great Eldin Skeleton.
This location sits Westward of Gut Check Rock.
Drop down toward the lake.
At the marked location you will find the Igneo Talus Titan.
The Talus is surrounded by a strong updraft to help mark its location and make engaging with it possible.
This deadly Talus is a major concern and requires Frost equipment to deal with.
Begin by firing an Ice Arrow at the torso of the Talus Titan.
This will cool its body, allowing Link to land safely on it without taking damage and stun it.
Land on its "torso" and begin attacking the Ore that is its core.
Watch of the body to start shaking.
When you see that happening, glide off over to the shore to avoid falling into the lava.
Repeat this process until you defeat the titan.
Once you have, glide safely back to shore.
Once the Titan has perished fully, you will see Kamia Omuna Shrine appear.
Go inside the shrine to complete this part of the song.