Cavern Bastion

Cavern Bastion, dangerous creatures from the wilderness are following a route straight towards the dwarves' base, forcing you to quickly build a defensive formation strong enough to stop each invasion. Warriors appearing in the reinforcement area can be pulled onto empty platforms along the battlefield, while new units will continue to be added periodically if the queue hasn't reached its maximum capacity. Bringing a hero into battle consumes energy, so players must consider when to deploy instead of filling every position immediately. Energy will gradually recover and increase after each enemy is defeated, allowing the defense to continue expanding throughout the battle. You can drag heroes from the queue to the hero position on the same platform to upgrade them to a stronger hero, up to a maximum of two upgrades. Besides troop deployment and leveling, the fortress's three support skills allow you to heal all allies, launch a devastating attack on all enemies, or activate a freezing seal to temporarily halt their advance. A level is only completed when the entire wave of invaders has been eliminated before the main base is destroyed. The defensive journey spans three distinct areas, each with its own battlefield, colors, and enemy creatures, and the difficulty increases progressively with faster, more resilient, and more dangerous enemies. Victory earns rewards needed to improve hero stats or purchase additional skill uses in the shop, thus enabling the dwarves to increasingly defend against larger attacks.