Pencil urchin?

PeterEde

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2x came on my latest live rock

20231104_221218.jpg
 
Looks cool!
Species ID isn't my thing but looks like "some kind" of pencil urchin to me.
Where did your live rock come from? ...somewhere in Australia (I assume)?
 
Black/Oblong Rock-boring Urchin - Echinometra oblonga; it could also be the Burrowing Urchin, E. mathaei, as the two are similar enough that E. oblonga was once considered a morph of E. mathaei,* but - based on the coloration of your specimen - E. oblonga seems more likely to me.

Either way, both species primarily reside in the rocks and primarily feed on turf algae of various kinds** - so a good herbivore for your tank.

*Source:
**Source:
 

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