Seven Knights Idle Adventure: 10-Star On Stage Rachel Diamond Cost

Reaching a 10-star On Stage Rachel in Seven Knights Idle Adventure requires an estimated budget of roughly 1,000,000 Diamonds. Because natural gacha drop rates alone cannot guarantee high-tier ascension, securing a fully promoted copy relies heavily on rate-up banner pity mileage and accumulated summon points.

Realistic Diamond Thresholds and Star Milestones

Ascending a rate-up hero demands an escalating number of duplicates for each tier. While earlier star ranks unlock quickly, the top tiers demand multiple copies per star.

Diamond Budget Range	Realistic Star Rank Target	Role and Account Impact
100,000–250,000	Base unlock to 2–3 Stars	Provides baseline buff utility and initial stage deployment.
300,000–600,000	4 to 6 Stars	Delivers solid combat scaling and reliable stage clears.
700,000–1,000,000+	8 to 10 Stars	Reaches maximum stat multipliers, passives, and trait potential.

Spending 100,000 to 250,000 Diamonds typically secures early promotions, but progression slows dramatically past 5 stars. Pushing into the 8-to-10-star range requires the full 1,000,000 Diamond reserve to absorb duplicate requirements at the top of the curve.

Raw pull rates fluctuate heavily across large summon sessions. Dry spells lasting 100,000 to 150,000 Diamonds without an on-banner duplicate can happen during extended pulling sessions. Pity mechanics counteract this variance:

Mileage Thresholds: Rate-up banners grant fixed milestone rewards and duplicate chests as summon points accumulate. These guaranteed drops supply a substantial portion of the copies needed for maximum ascension.
Summon Level Progression: Spending high volumes of Diamonds steadily raises your account Summon Level. Higher summon tiers improve baseline legendary drop distributions across all pulls, providing marginal rate improvements as the session continues.

Track your total duplicate count against remaining Diamonds throughout the session. If poor drop variance leaves you trailing behind target milestones, consider stopping at 6 or 8 stars rather than emptying your currency without completing the final star rank.

Resource Priorities After Summoning

Acquiring duplicates provides the promotion framework, but realizing a 10-star hero's performance requires immediate investment in secondary currencies:

Level Cap (Gold and Hero EXP): Maximize character level immediately so high-star percentage stat multipliers scale off an expanded base stat pool.
Skill Books: Upgrade combat skills to ensure damage and team buffs match higher stage demands.
Potential Rerolls: Spend potential dice on newly unlocked slots to roll offensive and utility traits suited to her skill kit.
Fodder and Collateral Upgrades: Reinvest the secondary legendary heroes and elixir currency generated from the session into complementary team members.

Next Action: Assess Your Roster Before Committing

Before committing 1,000,000 Diamonds to On Stage Rachel, evaluate whether your account needs a single hyper-invested unit or broader team coverage. If your lineup lacks a high-impact buffer or primary damage dealer, fully ascending Rachel provides a long-term carry. If your team already has functional substitutes, dividing that currency across multiple future banners to secure multiple 4-to-6-star heroes provides greater overall roster depth.