Buildings

Buildings are special units that are immune to almost all spells. Buildings fall in to different categories, each with their own specific role.

Towers
Each faction has a total of 11 Towers, 3 in each lane and 2 protecting the Ancient. Towers in a lane get progressively stronger as you advance. Every tower (except the first one) in a lane is invulnerable until you destroy the tower before it. The 2 towers that are next to each faction's Ancient will become vulnerable once all 3 towers in any lane has been destroyed. These 2 towers must be destroyed in order to remove the Ancient's invulnerability. This means that the minimum towers a team needs to destroy in order to win, is 5 (the 3 in the lane and the 2 next to the Ancient).

The middle or inner base towers that are attacked without nearby creeps will regenerate that damage at a rate of 90hp/second and take only a quarter of the damage from illusions. If there are creeps nearby they will not regenerate at all and they will never regenerate damage from allied units either.

Destroying a tower will give every player on your team a bonus 200 gold.

All towers have True Sight in a 900 Area of Effect.

Ancients
Ancients are the big buildings found in the center of each faction's base. In order to win the game, each team has to destroy the opposing team's Ancient. Ancients are invulnerable until you destroy the 2 towers next to them.

Ancients have True Sight in a 900 Area of Effect.

Melee Barracks
The Melee Barracks controls the strength of melee lane creeps. Apart from creeps growing stronger periodically, the creeps in a lane can be given a boost by destroying the barracks in that lane. Destroying the melee barracks will boost the stats the melee creeps (that belong to the faction that destroyed the barracks) that spawn in that lane. The improved creeps also give less gold and experience.

Ranged Barracks
The Ranged Barracks controls the strength of ranged (and siege) lane creeps. Destroying the ranged barracks will boost the stats the ranged creeps (that belong to the faction that destroyed the barracks) that spawn in that lane. The improved creeps also give less gold and experience.

Mega Creeps
Once all the barracks in a base are destroyed, the faction that destroyed the barracks will be awarded Mega Creeps. Mega creeps are level 30, have all upgrades and are almost unstoppable.

Other Buildings
The other pillar-looking buildings in the bases have no effect on winning the game, but can be destroyed for bonus gold.