Obtain it from Sentinel-related loot sources
Farm Sentinel missions, events, or bosses that drop Sentinel materials
Check the in-game crafting or upgrade menu for conversion recipes
Buy it from the in-game shop or vendor if available
Trade with other players if the game allows trading
Complete Sentinel quests or challenges that reward it
Open Sentinel-themed crates, chests, or reward packs
Use the game’s item codex or source tracker to find the exact drop location