By the way you can find these sentinel pillars
First is murdering enough sentinels at 5 starts to shut down their forces Opening salvaged glass from killed sentinels You can get one from the stations, either the cartographer or one of the guilds
There’s another type of multi tool you can get from korvax lore monoliths after some requirements
spoiler
You need to do the autophage quest, then on dissonant planets you’ll find a korvax pillar, and look for some purple sparks, feed it atladentum and you’ll get a multi tool https://nomanssky.fandom.com/wiki/Multi-Tool_Catalogue_-_Atlantid