Entrati Lanthorn is a Zariman mission reward (about a 9.76% chance) alongside Voidgel Orb, so a quick Halako Perimeter Extermination repeated a few times is an efficient early source; it’s a fixed-table mission reward roll, so resource drop boosters don’t apply.
Boosters don't apply: this spot is a container/deposit pickup, not an enemy drop.
Entrati Lanthorn also appears in the Cambion Drift bounty reward tables (as it does in Zariman bounties), giving a steady endgame supply alongside standing and other bounty rewards; bounty rewards are fixed-table payouts, so resource drop boosters don’t apply here.
Boosters don't apply: this spot is a container/deposit pickup, not an enemy drop.
Entrati Lanthorn is a Zariman mission reward from Halako Perimeter (Extermination), and also shows up as a bounty reward on both the Zariman and Deimos’s Cambion Drift. Running Halako Perimeter Extermination gives you a shot at its end-of-mission reward-table roll (about 9.76%), while rotating through a few Entrati or Zariman bounty stages tends to net a Lanthorn or two per bounty chain.
Both sources are fixed reward-table rolls (mission-end and bounty-completion rewards), not in-mission resource pickups, so Resource Drop Boosters don’t affect Entrati Lanthorn from either source.
Once you’re deep into Entrati and Holdfast crafting, alternate between Halako Perimeter Extermination runs and stacking Cambion Drift / Zariman bounties back-to-back for their Lanthorn reward slots. Since neither source is booster-affected, the efficient late-game loop is simply to run more missions and bounty chains rather than saving boosters for this resource.