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Season 10Sep 2026 ends in
โ˜… Legendary Front Line

Mossbert

Legendary โ€ข Front Line

Currently unobtainable.

These heroes cannot be added to your collection. They still show up in Rumble Chess: the card draw includes them, and the game guarantees them at level 9 or higher there.

Mossbert
Base Attack (Lv. 1)
40
Attack Speed
Slow3s
Attack target
Front Line
Deploy Cost
8Sun
Rarity
Legendary

โšก Skill

Mossbert skill icon

Ready: Reduces the number of Rush Squad Units summoned by up to 2 Minions by 1 each. For each Minion affected, this Minion summons 1 extra Rush Squad Units with 30% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to 4 Minions by 1 each. For each Minion affected, this Minion summons 1 extra Rush Squad Units with 30% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to 8 Minions by 1 each. For each Minion affected, this Minion summons 1 extra Rush Squad Units with 30% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to โ€” Minions by 1 each. For each Minion affected, this Minion summons 1 extra Rush Squad Units with 30% less HP.

Lv 1โ€“7
Rumble Chess (Lv 7)
Ready: Reduces the number of Rush Squad Units summoned by up to 2 Minions by 1 each. For each Minion affected, this Minion summons 1 extra Rush Squad Units with 30% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to 4 Minions by 1 each. For each Minion affected, this Minion summons 1 extra Rush Squad Units with 30% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to 8 Minions by 1 each. For each Minion affected, this Minion summons 1 extra Rush Squad Units with 30% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to โ€” Minions by 1 each. For each Minion affected, this Minion summons 1 extra Rush Squad Units with 30% less HP.
Lv 8Ready: Reduces the number of Rush Squad Units summoned by up to 2 Minions by 1 each. For each Minion affected, this Minion summons 1 extra Rush Squad Units with 25% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to 4 Minions by 1 each. For each Minion affected, this Minion summons 1 extra Rush Squad Units with 25% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to 8 Minions by 1 each. For each Minion affected, this Minion summons 1 extra Rush Squad Units with 25% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to โ€” Minions by 1 each. For each Minion affected, this Minion summons 1 extra Rush Squad Units with 25% less HP.
Lv 9Ready: Reduces the number of Rush Squad Units summoned by up to 2 Minions by 1 each. For each Minion affected, this Minion summons 1 extra Rush Squad Units with 20% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to 4 Minions by 1 each. For each Minion affected, this Minion summons 1 extra Rush Squad Units with 20% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to 8 Minions by 1 each. For each Minion affected, this Minion summons 1 extra Rush Squad Units with 20% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to โ€” Minions by 1 each. For each Minion affected, this Minion summons 1 extra Rush Squad Units with 20% less HP.
Lv 10Ready: Reduces the number of Rush Squad Units summoned by up to 2 Minions by 2 each. For each Minion affected, this Minion summons 2 extra Rush Squad Units with 20% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to 4 Minions by 2 each. For each Minion affected, this Minion summons 2 extra Rush Squad Units with 20% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to 8 Minions by 2 each. For each Minion affected, this Minion summons 2 extra Rush Squad Units with 20% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to โ€” Minions by 2 each. For each Minion affected, this Minion summons 2 extra Rush Squad Units with 20% less HP.
Lv 11Ready: Reduces the number of Rush Squad Units summoned by up to 2 Minions by 2 each. For each Minion affected, this Minion summons 2 extra Rush Squad Units with 10% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to 4 Minions by 2 each. For each Minion affected, this Minion summons 2 extra Rush Squad Units with 10% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to 8 Minions by 2 each. For each Minion affected, this Minion summons 2 extra Rush Squad Units with 10% less HP.Ready: Reduces the number of Rush Squad Units summoned by up to โ€” Minions by 2 each. For each Minion affected, this Minion summons 2 extra Rush Squad Units with 10% less HP.
Lv 12Ready: Reduces the number of Rush Squad Units summoned by up to 2 Minions by 2 each. For each Minion affected, this Minion summons 2 extra Rush Squad Units.Ready: Reduces the number of Rush Squad Units summoned by up to 4 Minions by 2 each. For each Minion affected, this Minion summons 2 extra Rush Squad Units.Ready: Reduces the number of Rush Squad Units summoned by up to 8 Minions by 2 each. For each Minion affected, this Minion summons 2 extra Rush Squad Units.Ready: Reduces the number of Rush Squad Units summoned by up to โ€” Minions by 2 each. For each Minion affected, this Minion summons 2 extra Rush Squad Units.

Drag two Minions of the same type and โ˜… rank onto the same tile on the board to promote them to the next โ˜…; their ATK is added together. Minions go up to 3โ˜… (Merge Minion); only in Rumble Chess do two 3โ˜… Minions merge into a 4โ˜… (Rumble Chess โ€“ 4โ˜… Minions). โ€œโ€”โ€ means the value is not known yet.

๐Ÿ“ˆ Levels in Rumble Chess (Lv 7โ€“12)

This hero cannot join your collection, so there is nothing to pay for. In Rumble Chess it comes at level 9 or higher; this is what each level changes.

Level ATK gained Effect
Level 7 โ€” Starting level
Level 8 โ€” Reduces the HP of Rush Squad Units summoned by this Minion by 25%.
Level 9 โ€” Reduces the HP of Rush Squad Units summoned by this Minion by 20%.
Level 10 โ€” Increases the reduction/boost in Rush Squad Unit quantity to 2.
Level 11 โ€” Reduces the HP of Rush Squad Units summoned by this Minion by 10%.
Level 12 โ€” Rush Squad Units summoned by this Minion no longer have reduced HP.