Each player has a pair of 3x3 size Arena Towers on their respective side of the map, one on the left and one on the right of the King's Tower.
Each Arena Tower is 3 tiles from the side of the Arena and 4 tiles from the back (the Arena is 18 tiles wide, 36 tiles long).
Destroying an opposing Arena Tower awards you a Crown, and grants you additional territory across the river where cards can be cast upon.
The level of your Towers is equivalent to your King Level.
The Arena Tower's hitpoints and damage are increased by roughly +8% per level from levels 1 to 9 and roughly +10% per level from levels 10 to 13.
Since card damage and health increases by +10% per level, maxed level 13/11/8/5 gameplay is practically identical to maxed level 9/7/4/1 tournament gameplay (only the two Spells that increase by time, Rage and Freeze, are truly stronger at higher levels). At lower levels Arena Towers are slightly stronger compared to cards.
For example, an Arena Tower will kill a same level Knight in 14 shots at levels 1-3, 15 shots at levels 4-7, and 16 shots at levels 8-13. A level 1 Rocket will take 17.2% of the health of a level 3 Arena Tower while a maxed Rocket will take 19.5% of the health of a maxed Arena Tower.
The Arena Tower is a ranged tower that deals damage to opposing troops and can attack both air and ground units.
However, they have decreased range versus a normal Princess, have a faster hit speed, deal less damage, and don't have splash damage as they don't appear to have multiple arrows nocked.
It is possible that the Princesses on the Arena Towers deal less damage than normal Princesses because their arrows aren't on fire.
Before the November update, they had a different appearance than the Princess.
The November Update slightly modified the shooting animation of the Princess atop the Arena Tower. The animation now appears smoother and the Princess now leans backward more clearly before shooting. The appearance also changed so now it looks like a normal Princess.
All damaging Spells and the Miner deals reduced damage to Crown Towers.