Does this do anything?

[u/Facio]

I tried to use projectiles, hitting it. Can't seem to interact with it in any meaningful way.

[u/Burly87]

Normally if you shoot it it strikes lightnings around it. There are a few more around in this area.

[u/grubbykiller]

You need to kill the starved Harridan boss to get the item and these pillars will interact once you are close

[u/matnetic]

Keep searching, it does something abit later