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Thunderclasts are enormous stone beasts, easily five or six times largertaller than a person, with their hands alone being six feet long.{{book ref|sa1|60}}{{book ref|sa1|part=prelude}} They take a skeletal, humanoid form, with long limbs that end with spiky, clawed fingers. On their chests, they have rib-like protrusions, and there are ridges running along their backs.{{book ref|sa2|4}} Their heads are narrow and arrow-like, with glowing red eyes.{{book ref|sa2|4}}{{book ref|sa3|84}}
The thunderclast proper, however, is a [[singer]]kind soul. The potential thunderclasts are far more powerful than theirof [[FusedVoidspren]] kinsmen, and much more twisted, to the point where they barely resemble their species. When theyone desiredesires to take on a physical form, theyit sinksinks into the stone and animateanimates it, ripping themselvesitself out inof the stone in its humanoid form.{{book ref|sa3|115}} As such, theythe retainbody retains some qualities of the material they take on, like the color or a covering of moss or fungus.{{book ref|sa2|4}}
It'sIn possible that there are other typesone of [[CognitiveDalinar's Realm|Cognitive]]visions, entitieshe thatsees cana create thunderclasts, as ared [[spren]] is also seen at one point plunging into the ground right before a thunderclast rips itself out.{{book ref|sa2|4}}
<gallery caption="Images of thunderclasts">
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