The Battle Ram is unlocked in Arena 3, Barbarian Bowl, in Clash Royale.

Context and quick notes:

• Arena progression in Clash Royale determines which new cards you can obtain; Battle Ram is listed as an unlock at Barbarian Bowl (Arena 3) in official and community wikis.

• The card is a Rare 4-elixir troop that targets buildings, with a charging mechanic that doubles damage on the charge. It reveals two Barbarians after impact or destruction.