Seven Knights Idle Adventure: 10-Star Fenrir Diamond Cost

To fully max out Fenrir to 10 stars (5 purple stars) in Seven Knights Idle Adventure, budget between 900,000 and 1,050,000 diamonds on her dedicated rate-up banner. You need 35 total copies of Fenrir—one base unlock and 34 duplicates—to complete all ten promotion tiers.

Reaching this total within a 1-million diamond budget relies on combining natural drop rates with guaranteed mileage pity chests from the active rate-up banner.

Diamond Cost and Copy Requirements by Tier

Hero promotion in Seven Knights Idle Adventure progresses through two phases: 1-star through 5-star yellow, followed by 1-star through 5-star purple (Tiers 6 through 10).

Promotion Stage	Total Copies Required	Estimated Diamond Cost	Primary Acquisition Method
Base Unlock (0-Star)	1 Copy	10,000 – 30,000	Early Banner Pull / First Pity
1-Star to 5-Star Yellow	7 Copies	200,000 – 300,000	Direct Pulls + Early Mileage
1-Star to 4-Star Purple	20 Copies	550,000 – 700,000	Balanced Pulls and Pity Milestones
5-Star Purple (10-Star Max)	35 Copies	900,000 – 1,050,000	Full Mileage Cycles + Natural Drops

A full 1,000,000-diamond summon session on the rate-up banner provides a predictable duplicate return because the summon mileage track guarantees copies at regular intervals:

Natural Summon Drops: Direct summon drops typically supply 16 to 20 Fenrir copies across 1,000,000 diamonds, with drop rates slightly improving if your account has unlocked higher summon levels.
Mileage Track Pity: Guaranteed mileage chests make up the remaining 15 to 19 copies. The mileage track loops continuously, ensuring every 100,000 diamonds spent establishes a steady baseline of guaranteed duplicates even during bad pull streaks.
Single-Banner Focus: Do not split diamonds between standard summons and the rate-up banner. Spreading resources prevents you from looping through the rate-up mileage rewards that make the 1-million diamond target achievable.

Recommended Stopping Points

Committing nearly one million diamonds is not practical for every account. Choose an intermediate promotion target based on your current diamond reserves:

Base Unlock to 1-Star Yellow (1–2 Copies): Costs roughly 20,000 to 50,000 diamonds. This unlocks Fenrir for your codex, grants account-wide passive stat bonuses, and makes her available for testing in specific stages.
5-Star Yellow (7 Copies): Costs 200,000 to 300,000 diamonds. This is the recommended stopping threshold for free-to-play and low-spending players. At 5-star yellow, Fenrir gains access to key baseline stat multipliers, making her viable in PvE and PvP formations without draining your entire resource pool.
10-Star Purple (35 Copies): Costs 900,000 to 1,050,000 diamonds. This target is best reserved for players who have saved thoroughly or spend competitively. While the final five purple stars provide major offensive and defensive scaling, acquiring them costs more than triple the diamonds required for 5-star yellow.

Collateral Progression from a 1-Million Diamond Session

Spending one million diamonds on a single banner also advances broader account progression:

Summon Level Increases: Pulling thousands of times levels up your summon rank, permanently increasing baseline Legendary drop rates for future summons.
Codex Stat Buffs: The large volume of lower-rarity heroes allows you to max out star levels for Common, Rare, and Extra units, granting passive account-wide combat power.
Growth Materials: Duplicate conversions yield hero exchange currency and promotion elixirs, supplying the upgrade materials needed to level Fenrir immediately after summoning.

Diamond Budgeting Rules Before Pulling

Do not chase 10 stars with under 900,000 diamonds: Stopping short at 7 or 8 stars leaves you without Fenrir's highest stat tiers while completely exhausting your savings for future rate-up banners.
Cap your spending at 5-star yellow if you have under 400,000 diamonds: If your reserves sit between 200,000 and 400,000 diamonds, stop pulling as soon as you reach 5-star yellow.
Check your team's role coverage: Only invest 1,000,000 diamonds into maxing Fenrir if your core team already has functional coverage for essential dungeon roles.