I just read the Japaneses Towers page, and I think it needs a boss mob. The Oni is a Japaneses demon, and I think that there should be at least one in each tower. But, Unlike the Wall-phaser, It behaves like the Iron golem, meaning it will hunt you down, and can leave the temple, and unlike the Iron golem that will leave you alone if you get far enough away, the Oni will follow you no matter how far away you are. And, each time it kills you, you lose one level, no matter what your level is, so even if you are level 9999, Get killed by an Oni, and you are level 9998. If killed at level one, the Oni will go back to the temple, and you will not lose a level. It can smash any block (not bedrock, of course) and climb ladders.