The Seven Deadly Sins: IDLE Phase 1 Defense Battle Low Silver Guide

To clear Phase 1 Defense Battle in The Seven Deadly Sins: IDLE with minimal starting silver, populate your board tiles with baseline units before buying shop upgrades, merge matching pairs to manage board limits, and shift your silver into global attack power once summon costs escalate. Surviving on low starting silver depends on maximizing attack uptime along overlapping path lines rather than fishing for high-rarity units.

Early-Wave Spending and Board Setup

Spend your opening silver entirely on summoning baseline units to fill your grid. Boosting stats on an empty or half-filled board yields far less damage than deploying four to five active units to stop early swarms. Do not hoard silver during the first three waves, as unspent silver provides no defensive pressure against fast scouts.

Follow this spending sequence during the opening waves:

1. Populate the board: Summon standard units until primary combat tiles are active.
2. Merge matching pairs: Combine identical one-star units to open tile capacity for new summons.
3. Purchase baseline attack: Buy the first tier of the global Attack power upgrade once your grid has four to five active attackers.
4. Hold an emergency buffer: Reserve a small amount of incoming drop silver to summon reinforcements or purchase stat tiers if leaks threaten the end of the track.

Avoid early re-rolls. Standard field units handle early waves effectively as long as your total number of active attacks keeps pace with incoming enemy counts.

Mid-Wave Economy: When to Pivot to Global Upgrades

In Phase 1 Defense Battle, each subsequent summon increases in silver cost. Once a single summon costs more than the next tier of the shop's global attack upgrade, stop purchasing random spawns and direct your silver toward team-wide attack buffs.

• Summon Cost Threshold: Stop spamming unit summons when the rising summon price exceeds early global stat upgrade costs.
• Global Upgrade Value: Team-wide attack boosts affect every unit deployed on the grid, delivering far more total damage per coin than adding an unmerged low-tier unit.
• Controlled Merging: Only merge two-star units when board capacity is reached. Blindly merging two functional damage dealers risks producing a low-utility support unit, which lowers your net lane damage.

Prioritize keeping stable damage dealers on active track corners. Keeping waves cleared before the next spawn ensures your silver generation remains uninterrupted.

Boss Wave Positioning and Targeting

Bosses in Phase 1 feature heavy health pools and fast movement speeds. To stop them from slipping through your perimeter, align your unit types with the path geometry:

• Single-Target Burst: Place your strongest single-target damage dealers at intersections and 90-degree corners. These tiles offer the longest firing windows as the boss rounds the bend.
• Area-of-Effect (AoE) Units: Station AoE attackers slightly ahead of your main single-target chokepoint. They weaken and eliminate minor escort mobs so your burst units do not waste attacks on low-threat minions.
• Late-Track Silver Burn: If a boss passes the final bend with more than 25 percent health remaining, spend all banked silver immediately on global attack upgrades. Fresh low-tier summons placed late in the track do not have enough time or base attack power to burn through the remaining boss health.

Pitfalls to Avoid in Low-Silver Runs

Managing scarce silver requires avoiding common traps that waste board space and currency: