Schematic: Scarlet Helicid
You can loot Schematic: Scarlet Helicid on Antecedent Isle, on top of the big arc on the left side.
To collect this schematic you need to travel to Antecedent Isle.
After teleporting look straight, you should see a large arc.
The schematic is almost on the top of that arc, sits next to the spot where a pillar connects the arc.
/way 47.7 9.5
On top of the big arch structure