How to get healthstone form slag pit ?

[Quickdraw]

Exactly form... there
https://steamcommunity.com/sharedfiles/filedetails/?id=1930907915

[Q]

This confused me a lot as well, but I will simply say, keep playing the game, directly to the right of this ledge is a small, upside down "U" with 3 circles on it. You will eventually get an ability very late in the game to activate these. So if you ever see that thing on the floor, just make a note to come back later.

[Quickdraw]

I knew this mark have something to do with it. Thanks.

[D1GP Specialist]

To get this healthstone in the end of the Slag Pit, it's required to complete the 11th level (the 1st screenshot) where we can collect the ether spark item (sorry if this isn't the correct English translation because my game is running in German) & then we can return to the Slag Pit again which is required to be visited atleast 2, 3 or more times (actually probably like every other map in this game); also here are a few helpful screenshots which I made of the Slag Pit (the last 2 screenshots):
https://steamuserimages-a.akamaihd.net/ugc/1709660756465764185/618A71B7835BA8B2E3E3F829AB96C9F17C5A1142/
https://steamuserimages-a.akamaihd.net/ugc/1709660756465763321/F819081D14BD4B8E1B6F006C1A20435C9E66F190/
https://steamuserimages-a.akamaihd.net/ugc/1709660756465761838/DC5AD41310BD8860B52EA429AFF98D12F432174E/