Everyone dreads towers. You're constantly fighting through so many floors and you finally reach a boss after losing most of your health. But this is why they make such a good challenge and that's what us capped players need.
Introducing; The Eternal Tower
This tower will have what feels like an endless amount of floors (though would end at around 50~100).
This tower can only be done solo.
Porting out will result in having to start from the beginning to prevent potion abuse.
Each floor will have 2+ opponents, gradually increasing in strength for example; first floor will have Rank 1 Opponents, the second floor will have Rank 1 Elite Opponents, the third floor will have Rank 1 Boss Opponent + minion, floor 33 will have Rank 10 Boss Opponent + minion/s etc etc.
No cheating from any bosses until the final 3, the first 2 will have cheats which will prepare you for the last boss.
There will be a rest stop with wisps every 10 floors.
Boss drops will be rewarding to their level, some crown items may even be dropped/megasnacks, though they become increasingly more likely as the Boss rank increases.
The final bosses at floor x y and z will drop unique school based gear and other items (amulets/housing items/ reagents) and you will receive a title upon completion.
The tower will either have a quest that will allow access once you reach level 30+ and may be found in an open area (Olde Town/Unicorn Way etc) or will be accessible at any level and be found in a crowns/membership area (Marleybone/Grizzleheim etc) to ensure KI staff gain some profit from this.
To ensure this is a challenge to all Wizards, bosses may have varied resistances or increased damage to their respective schools, or may even be dual schooled at higher ranks.
I would love for an idea like this to come into fruition. It has to be a real challenge that even Veteran Wizards would struggle endlessly to complete, and the rewards must be deserving of the challenge as well. It's things like these which extend many Wizards' memberships apart from pvp. Sure it'll make many ragequit at some point but then they'll have to come back again once a few Wizards complete the tower and present their techniques, knowledge is power!
Another Idea would be;
Timeless Tower
This tower will host main storyline quest bosses on each floor and their minions
If you port outside, you must start again from the beginning
This tower can only be done solo
Every "Final Boss" to their respective worlds (Meowiarty/Jade Oni) will have enhanced abilities and may even cheat, they will also drop crown items/megasnacks/seeds or even a few unique housing items and rare reagents.
Wisps after each "Final Boss" fight.
Tower itself should be found in a relatively easy to access area (Olde Town/Commons) but will a crowns/membership area itself.
Many Wizards would love to relive the many fights that go them to where they are but restarting on another Wizard and going through all the quests is a chore. This will be a rewarding solution to that!