How It Works 
This tower event is an event with 20 floors per lap and boss fights every 5 floors. In each case, you are allowed three allied units and one of your own units. 
Once you have completed all 20 floors, you complete a lap and start over again at floor one. Defeat a boss every 5 floors for randomized reward. The bosses at floors five, ten, and fifteen give lesser rewards.  When you defeat the boss at floor twenty, you get a reward card which has a chance of being an event reward.  Bosses will get more hit points the more laps you complete, making it harder to defeat them.
  New Units 
|  Unit Name  | 
 Rarity  | 
 Type | 
 Cost  | 
 Speed  | 
 Range  | 
 Max Land  | 
 Max Air  | 
 Max Sea  | 
 Max Total  | 
 Skill  | 
 Source
 | 
   Holly  | 
 5  | 
 Magic  | 
 30  | 
 E  | 
 150  | 
 41500  | 
 33750  | 
 36300  | 
 111550  | 
 Knockback  | 
 Random lap clear reward
 | 
   Debbie  | 
 4  | 
 Missile  | 
 25  | 
 D  | 
 175  | 
 29530  | 
 27500  | 
 24272  | 
 81302  | 
 none  | 
 Random lap clear reward
 | 
   Annie  | 
 3  | 
 Melee  | 
 20  | 
 B  | 
 130  | 
 10660  | 
 1583  | 
 10660  | 
 22903  | 
 Poison  | 
 Random lap clear reward
 | 
  Bosses 
|  Floor  | 
 Boss  | 
 Name  | 
 Type  | 
    | 
    | 
  
 | 
|  5  | 
    | 
 Troll  | 
  
 | 
 D
 | 
 B
 | 
 B
 | 
|  10  | 
    | 
 Kraken  | 
  
 | 
 B
 | 
 B
 | 
 D
 | 
|  15  | 
    | 
 Cyclops  | 
  
 | 
 D
 | 
 C
 | 
 D
 | 
|  20  | 
    | 
 Devil  | 
  
 | 
 A
 | 
 C
 | 
 D
 | 
  Rewards 
  Floor Rewards 
To complete a lap, you must beat a boss on a floor which is a multiple of 20.  You will randomly receive one of these rewards.
|  Icon  | 
 Reward  | 
 Rarity
 | 
    | 
 Holly  | 
 5★
 | 
    | 
 Devil  | 
 5★
 | 
    | 
 Debbie  | 
 4★
 | 
    | 
 Annie  | 
 3★
 | 
    | 
 Minotaur  | 
 3 ★
 | 
    | 
 Ravenous Bear  | 
 2★
 | 
    | 
 Crimson Crab  | 
 2★
 | 
    | 
 Nils  | 
 1★
 | 
Beating a mini-boss, which are all floors which are multiples of 5, but not of 20, will give one of these rewards.
|  Icon  | 
 Reward
 | 
    | 
 Ambrosia x 1
 | 
    | 
 Luna x (500 - 10000)
 | 
    | 
 Brave x (200 - 800)
 | 
    | 
 Time Elixir x 1
 | 
    | 
 Time Elixir x 3
 | 
    | 
 Time Elixir (P) x 1
 | 
    | 
 Time Elixir (P) x 3
 | 
    | 
 Potion x 1
 | 
    | 
 Potion x 3
 | 
    | 
 Potion (P) x 1
 | 
    | 
 Potion (P) x 3
 | 
    | 
 Premium Ticket x 1
 |