The Best Last War Survival Guide: Mastering the Oasis Project, Spice Wars & Dig Sites

The Oasis Project is the central Week 5 objective. Your warzone is working toward greenifying 100,000 lands, but the tactical approach changes with Dig Sites, also called Digging Strongholds. Instead of only converting desert near captured cities, squads can now move across the desert map to available Dig Sites and greenify the surrounding tiles.

Start with Level 1 Dig Sites. When the warzone has cleared and greenified enough Level 1 sites, Level 2 Dig Sites become available, followed by higher levels. This progression rewards alliances that spread out, cover multiple sites, and keep their members active instead of concentrating all activity in one place.

Greenifying one desert tile costs 10 Stamina. A plane flies over the selected tile and converts it into green land, so large-scale Oasis Project progress can consume stamina quickly if you spend without a plan.

The efficient move is to hold meaningful stamina spending for a Stamina Arms Race event. You then receive value twice from the same stamina: Oasis Project progress for your warzone and Arms Race points for your individual event score. This is one of the easiest Week 5 habits to turn into a real account advantage.

Open the Seasons page and select Build an Oasis to track the warzone-wide greenification effort. The Level 1 Region starts behind a percentage tracker. When the Greenification Rate reaches 80 percent, the next region automatically unlocks, opening new territory and better progression opportunities.

Also check the Warzone Progress tab regularly. Your personal contributions reach reward milestones at 80, 100, 125, 150, 200, and 250 greenified tiles. These chests are easy to miss when you are focused on the map, so make claiming them part of your routine.

Greenification can uncover Desert Artifacts, creating a time-sensitive map race. In the Artifacts tab within Build an Oasis, you can see which artifacts have appeared and use the interface to locate them on the map.

Artifact availability is capped. For example, only 12 Desert Artifacts may be available after a spawn. That makes speed more important than perfect planning: locate the artifact, dispatch troops immediately, and communicate the target to your alliance before nearby rivals collect it.

Check the Desert Bazaar at the start of a new week because its inventory refreshes. Week 5 event currency should go toward items that immediately accelerate your active seasonal plan rather than low-impact convenience purchases.

The premium priority is the gold Overlord Supply Chest. High-value Speed-up tokens are also strong purchases because they let you respond to building, battle, and progression timing without falling behind your alliance's pace.

Week 5 reaches Round 5 of Spice War, such as Scarlet Legion versus Golden Tribe. The seasonal phase is nearing its conclusion, with only three weeks of faction warfare remaining before the final cross-server confrontation in Week 8.

Battles take place on Wednesdays and Saturdays. Depending on your faction position, you may have only one or two attacks left for the phase, so do not throw them at low-value targets. Coordinate with alliance leadership, concentrate attacks where they can steal meaningful Spice, and preserve top resources and speed-ups for the remaining battles and the Week 8 finale.

The Altar is one of Week 5's most important but overlooked season buildings. Upgrade it as far as possible because each level increases Protector HP, Attack, and Defense. Those percentage boosts can materially change World Boss damage, especially when a stronger Protector lineup pushes you across a damage threshold and into a higher reward tier.

Season-building upgrades also grant Profession EXP. This is a second reason not to neglect the Altar: consistently upgrading season buildings feeds your Engineer or other Profession progression, helping you earn scarce skill points and unlock passive buffs that remain valuable through the rest of Season 3 and into Season 5 Week 2 planning.

Season 3 Week 5 rewards patience, map awareness, and timing. The strongest players do not view Oasis Project, Arms Race, Artifacts, Spice War, and season buildings as separate chores. They plan each action so it advances multiple rewards at once.

The simplest Week 5 rule set is to greenify during Stamina Arms Race, help the warzone unlock new Dig Site regions, claim Build an Oasis milestones, react immediately to limited Desert Artifacts, spend only on the best Desert Bazaar items, and save limited Spice War attacks for alliance-approved targets. Finish by keeping your Altar upgrades moving so World Boss damage and Profession EXP do not fall behind.