Stats and progression

Your Fantum's stats are rolled at mint and then largely fixed for life. Reborn deliberately avoids the XP-grind treadmill — your Fantum is who they are. What changes over time is ELO and trophy state.

This is a design choice, not a constraint. Endless-grind games burn out. Stat-locked PvP games last.

What's set at mint

Rolled deterministically from (masterSeed, tokenId) via the SplitMix-seeded xorshift128+ shuffle in Xorshift.sol:

Stat block	Range	Mutable?
STR	3–18 (+5% OG boost, cap 20)	No
DEX	3–18 (+5% OG boost, cap 20)	No
CON	3–18 (+5% OG boost, cap 20)	No
INT	3–18 (+5% OG boost, cap 20)	No
WIS	3–18 (+5% OG boost, cap 20)	No
CHA	3–18 (+5% OG boost, cap 20)	No
Weapon	1 of 11	No
Archetype	1 of 19	No
Tier	1 of 5	No
Fluro variant	1 of 7 (incl. two-tone, Phantom, Holo)	No
isOG	true if minted via legacy window	No
legacyDna	ancestor FUM hash, if OG	No

None of the above changes. Ever. Your Common Stagehand with STR 14 / DEX 10 / WIS 7 with a candelabra is, for the entire life of the token, that Fantum.

What changes over time

State	Range	Mutated by
ELO	starts at 1000	Every duel result, signed and submitted on-chain
Wins	starts at 0	Increments on duel win
Losses	starts at 0	Increments on duel loss
Resurrect count	starts at 0	Increments on revive from Graveyard
Trophy DNAs[]	starts empty	Appends ancestor hash on each kill (if proposed mechanic is enabled)
Name	starts unnamed	Settable post-launch v1.1 via `setName(uint256, string)` for an sFUM fee
Vanity / Duel flag	starts as set at mint	One-way switch to Vanity, cannot switch back

These mutable fields are stored in a separate slot from the immutable stat block, so reads stay cheap for the duel contract and writes don't churn the cold-state.

ELO mechanics

Base at mint: 1000
After a duel: delta computed by the off-chain matchmaker, signed via EIP-712, submitted on-chain
The on-chain contract verifies the signature but does not re-derive the ELO math — the keeper EOA is trusted for the delta computation
OG winners get a +10% multiplier on their delta gain; losers' loss is unchanged
Tournament wins get a +1.25× multiplier during the tournament week
Matchmaker uses ELO to find balanced opponents (target ΔELO ≤ 100 for casual pool, larger for ranked)

ELO can go up forever. ELO can go down forever. There is no floor and no ceiling. The leaderboard is sorted on ELO.

Win / loss records

Every Fantum has a permanent on-chain record of:

Total duels participated
Wins
Losses
Resurrections (from Graveyard)

This is visible in metadata via the on-chain renderer. It's a personal stat line — no global "career mode", just your token's history.

A retired Fantum (switched to Vanity mode permanently) carries its final ELO + win/loss record for the life of the token. You can sell a retired veteran with provable history.

Naming (v1.1)

Post-launch v1.1 adds setName(uint256 tokenId, string newName):

Costs sFUM (price climbs with character count, capped)
Only the current owner can set it
Stored on-chain in the Fantum struct
Renders in the metadata as a primary name field
The original Fantums had this — BUDDY LINDGREN, NA AFURONG — we're keeping the emotional hook

A few constraints:

Max 16 ASCII characters
No control characters
Once set, the previous name is overwritten (no history)
Burning to vanity does not burn the name

Trophy DNAs (proposed)

If the proposed trophy mechanic ships:

An OG Fantum that kills another Fantum in a stake-mode duel appends the dead one's legacyDna to its trophyDnas[] array
The array grows over the Fantum's lifetime
Visible in metadata: "Trophies: 3 ancestor DNAs collected"
Reset is impossible — trophies are permanent

This makes killing OG Fantums a status hunt. The proposal is in the contract architecture; the policy flag (default on / default off / opt-in) is configurable at deployment.

Levelling? No.

There is no level system. There is no XP. There are no skill points. You don't unlock new weapons. You don't get stronger over time.

What you do is build ELO, collect trophies, earn tournament titles, survive permadeath, and avoid getting swapped to vanity. The progression is reputational, not numerical.

Vanity mode is a one-way door

If you flip your Fantum to Vanity mode (cannot duel, half-price secondary royalties), you cannot go back. This is enforced in ArenaOptOut.sol. The flag is one-way.

The reason: it would be exploitable to flip into Vanity to dodge a tournament loss, then flip back. The permanence is the point. Once a fantum, always a fantum. Once retired, always retired.

What's set at mint​

What changes over time​

ELO mechanics​

Win / loss records​

Naming (v1.1)​

Trophy DNAs (proposed)​

Levelling? No.​

Vanity mode is a one-way door​

See also​