The Ninja Tower is a special event similar to Challenge Events in having a score based on "speed of completion and the amount of health left at the end" and final rewards dependent on ranking, but with no possibility of replays. Its stages, or "floors", are accessible through special Tower Energy (10, fully replenished each day; there are also rare Tower Flasks of 5, available in the Shop or as progress rewards). There is also a Tower Chest of loot every 5 floors. It is available to players from Level 20.
The Ninja Tower has a special gameplay mechanic: Oni Gems imparting Oni Curses on the Heroes barring them from further battles, and Oni Blessings, which buff all heroes for the event. It also features the Ninja Heroes Family, available for the Tower Coins rewards, and epic Ninja Troops.
The Ninja Tower was introduced in October 2020 (version 32). After its sister/alternate Tower of Magic was added in September 2021 (version 41), many Ninja Tower details were changed to its image: the changes brought more frequent Blessings and Chests, and floor reorganisation into two difficulties, Normal and Impossible accessible only after finishing the Normal; after January 2023 (v. 53) "revamp", each has 25 floors.
After the Clash of Knights and the third Tower of Styx were added, these events rotate in the 4-weekly slot, running for five days from Wednesday to Monday morning.
Intro-Dialogue[]
- Richard:
- The Ninja-Tower is here again and I want to go up there by all means!
- Ekanite:
- Our Clan gets stronger und only the best can reach the top!
- Azurite:
- Every stage is trickier than the last one ...
- The Strong will be blessed, the Weak cursed with forgetness.
- Ekanite:
- And now step forward!
Oni Curses[]
Oni Curse is a special tile that randomly appears on the board. On appearance, the Oni Curse is randomly allocated to one hero and the tile must be matched within three turns to avert the curse. Otherwise the designated hero becomes cursed; heroes cursed two times throughout the event are no longer usable in the Ninja Tower. The curse is also averted by ending the battle, be it victory or defeat; but NOT fleeing from the battle or just the cursed hero dying.
Oni Blessings[]
Oni Blessings are rewarded on completing every second floor. There is a pick from three potential buffs that apply in all subsequent floors to all heroes in the Tower team (but not outside the event). Blessings are fixed & the same for everyone (i.e. all players get the same choice of 3 after a given floor).
Blessings include: 5 % bonuses for attack, defense, health, mana generation, or critical chance; receiving a Lantern Minion (with 5 % stats) every 5 turns; gaining 50 health every 5 turns; + 5 % mana every 5 turns, … The same bonuses chosen on repeated occasions stack.
Every third Blessing (i. e. after multiples of 6) is a stronger Rare Blessing: 5% mana to all every time a Hero casts the Special Skill; stacks (max 10) of +5% attack or defence each turn to all, …
Deadly Chamber Effects[]
There are three Deadly Chamber Effects in the Ninja Tower.
- Toxic Vapor – all heroes take damage every 3 turns: 50 in stages 4 to 15, 75 until stage 20, 100 afterwards.
- Fragile Floor – the number of Items brought into battle is reduced: by 1 in stages 7 to 15, 2 until stage 25, 3 afterwards (i. e. all of the Impossible); for rarer items where this would decrease their standard number to zero, 1 is always allowed.
- Erratic Time – all Status Effects cast by heroes last shorter than normally: by 1 turn in stages 11 to 15, 2 turns afterwards; again, even naturally shorter effects last at least 1 turn.
In Impossible, a fourth Effect appears called Unnerving Resilience, consisting of 4 sub-effects.
Ninja Heroes[]
During the Ninja Tower event, the Family of special Ninja Heroes are available in the Ninja Summon. One summon costs 100 Tower Coins (the rewards are one Coin for every stage and ten in Tower Chests) or 300 Gems (ten summons for 2,600). The summon rates are: 
- Rare Classic Hero: 64.3 %
- Epic Classic Hero: 20.8%
- Legendary Classic Hero: 1.2%
- Rare Ninja Hero: 6.7 %
- Epic Ninja Hero: 5.7%
- Legendary Ninja Hero: 0.3 %
- Legendary Featured Ninja Hero: 1 %
- Hero of the Month Bonus Draw: 1.3%
There were 8 Ninja Heroes originally introduced (only 3 of them Epic, the rest Legendary), 3 more in "Round 2" (2021) and 2 in Round 3 (2022), making them 2 Legendary of each element; 2023 added 3 more incl. one Rare. All were named after precious stones (2023 added Japanese names) and their Special Skills are variable depending on "supercharging" their mana (Mana Speed is listed as "Charge"); typically, the 1x, 2x or 3x charge means one target, target+neighbors or all enemies/companions, with the effect also strengthening.
The Ninja Family has a bonus +5% chance to dodge normal attacks and Special Skills and a +5% chance to counterattack with 60% of the damage received, at a max of 3 heroes (+10% chance to dodge normal attacks and Special Skills and +10% chance to counterattack with 90% of the damage received).
| 3* Hero | 5* Heroes |
|---|---|
 Kinsaishi ( Holy), 2023 |
 Amethyst ( Dark), 2023
|
 Morganite ( Dark), 2023 |
 Azurite ( Ice), 2023
|
| 4* Heroes |  Cobalt ( Ice), 2020
|
 Ametrine ( Dark), 2020 |
 Ekanite ( Nature), 2023
|
 Sapphire ( Ice), 2020 |
 Garnet ( Fire), 2020
|
 Shale ( Fire), 2020 |
 Jade ( Nature), 2020
|
 Kushanku ( Holy), 2023
| |
 Mica ( Holy), 2020
| |
 Myoin-ni ( Nature), 2023
| |
 Oniwakamaru ( Ice), 2023
| |
 Onyx ( Dark), 2020
| |
 Peridot ( Nature), 2022
| |
 Quartz ( Dark), 2021
| |
 Ruby ( Fire), 2021
| |
 Serandite ( Fire), 2023
| |
 Tametomo ( Nature), 2023
| |
 Topaz ( Holy), 2022
| |
 Zircon ( Ice), 2021
|
Ninja Troops[]
During the Ninja Tower event, special Epic Ninja Troops are available from the Tower Troop Summon (formerly Ninja Troop Summon) that replaces the usual Epic Troop Summon.
The Ninja Troops (one for each element) are attack-oriented: Their stats on Level 1 are Attack 23 %, Defense 10 %, Healing Bonus 12 %, and unique ability Bypass Defensive Buffs 5 %; the fully levelled have 32 / 17 / 20 / 15. They are named after traditional Japanese weapons, with which they are depicted.
The summon rates are:
- Rare Classic Troop 85 %
- Epic Classic Troop 10 %
- Epic Ninja Troop 5 %
As the chance for Ninja Troops comes at the expense of baseline Rare Troops, while the 10 % of standard Epic remaining the same, it pays to save the tokens (or Gems) for the event; however after Magic Troops were introduced into Tower of Magic, these are preferred. Ditto for the latest Tower of Styx Troops that combine the Bypass Buffs with improving Mana generation.
