Updated June 2026
Sand Worm Boss in 100 Days At Sea
Sand Worm is the first major boss in 100 Days At Sea — located on Desert Island in a canyon arena, gating mid-game Scrap Metal and Blue chest tier progression. Stranded Devs designed Sand Worm around ranged DPS and burrow-strike avoidance; melee-only loadouts fail without Flintlock Pistol or Sharpshooter support. This guide covers summon location on desert island, gear from crafting, class picks, and post-fight farming paired with boss fights.
Location and Unlock
Island: Desert Island (Medium difficulty). Arena: desert canyon — follow canyon markers from main dock after Days 10–15 progression.
Prerequisites: ranged weapon (Flintlock Pistol minimum), 20+ cooked meals, Medkits, Cactus Water for heat.
No Pearl cost to summon — gear check only. First boss in six-boss chain on bosses.
Gear Requirements
Mandatory: Flintlock Pistol (10 Iron + 5 Gunpowder + 3 Wood) or Sharpshooter Scoped Rifle starter if unlocked.
Recommended: partial leather armor, Medkits (5 Cloth + 3 Herbs + 1 Alcohol), Bonfire cooked meals not raw fish.
Optional: Crab companion (+5% gun) or Parrot (+7.5% gun) from companions.
Grinder and Crab Trap from Desert visit should be complete per harpoon fishing.
Fight Mechanics and Phases
Phase 1 — Surface strikes: Sand Worm lunges from sand — ranged DPS during exposed windows. Melee players chase unreliable targets.
Phase 2 — Burrow: Worm submerges — reposition to marked erupt points, avoid sand splash AOE. Medics sustain chip damage.
Phase 3 — Enrage: Faster burrow cycle — Sharpshooter crit (+10%) and Cowboy (+15% ranged) shine. Pirate hybrid maintains DPS if pistol ammo low.
Co-op: one dedicated ranged minimum, optional Medic, builder stays on raft food duty per co op strategy.
Recommended Classes and Team Size
Solo: Cowboy or Sharpshooter mandatory. Survivor reduces hunger during long kiting.
Duo: ranged DPS + Medic or Soldier for sustain.
Trio+: add Raider for loot bonus on post-boss Scrap Metal farms.
Avoid Battle Buku-only melee solo unless experimental — community wipes documented on boss fights.
Loot and Post-Fight Farming
Sand Worm clear unlocks confident Blue chest tier farming — Scrap Metal, Gunpowder parts on chest tiers.
Boss may drop Pearl bundles and combat mats — varies by patch; stack with daily defeat quests on daily quests.
Post-fight: farm Scrap Metal for Grinder upgrades before sailing to shipwreck island.
Common Mistakes
Attempting without ranged weapon — restart after Flintlock craft.
Understocking meals — burrow phases extend fight time beyond hunger bar.
Skipping Cactus Water — heat kills during long attempts.
Next boss in chain: Ghost Captain on ghost captain after Iron farm.
Frequently Asked Questions
Where is the Sand Worm boss?
Desert Island canyon arena — Medium difficulty island after Jungle Island.
Can I beat Sand Worm with melee only?
Not recommended. Ranged weapon is mandatory for burrow phases.
What weapon do I need for Sand Worm?
Flintlock Pistol minimum — or Sharpshooter Scoped Rifle if class unlocked.
Is Sand Worm the first boss?
Yes. Starter and Jungle islands have no bosses — Sand Worm gates mid-game.
What should I do after beating Sand Worm?
Farm Scrap Metal and Blue chests, then sail to Shipwreck Island for Iron.