Elden Ring PC | Crystalians of Academy Crystal Cave boss fight solo on NG, then getting Terra Magica

I forgot what to expect with these guys. They weren't taking melee damage very well, so I used Night Maiden's Mist and it killed them very quickly. After defeating them and acquiring Crystal Release, you can climb the tower to get another sorcery, Terra Magica.

Drops:
3,960 runes
Crystal Release

Crystalians
"Crystalians are a Field Boss in Elden Ring. Crystalians are humanoids opponents made of crystals. They are encountered in different locations with varying weapon configurations but the one thing they share is their extremely tough crystal bodies. These are optional bosses as players are not required to defeat them to advance in Elden Ring."
https://eldenring.wiki.fextralife.com/Crystalians

Academy Crystal Cave
"Academy Crystal Cave is a Location in Elden Ring. The Academy Crystal Cave is found in Liurnia of the Lakes. The entrance is found west of the Raya Lucaria Academy."
https://eldenring.wiki.fextralife.com/Academy+Crystal+Cave

Crystal Release
"Crystal Release is a Sorcery in Elden Ring. Crystal Release spell bombards a large area with projectiles."
https://eldenring.wiki.fextralife.com/Crystal+Release

Terra Magica
"Terra Magica is a Sorcery in Elden Ring. Terra Magica spell creates a spherical zone that increases magic damage when damage is dealt while the user is in the zone."
https://eldenring.wiki.fextralife.com/Terra+Magica