In the waiting room, after getting rejuvenated as an additional reward for clearing the 15th floor, Russell shared the information with his Chaos Companions the rewards he was granted according to the Tower's will.
First, from the fifth floor, a pair of daggers that's Unique rank named "Dagger of Sorrows", which would cost at least hundreds of millions outside the Tower, but considering the assets that he currently possessed from selling the rights of the first Micro-Strayed Dungeon and doing investments, that amount of money would be a fine loss, but with benefits, at least.
Second, from the tenth floor, Russell received the Unique rank item named "Karas' Golden Feather". It's only a miscellaneous one, but in the description, it was written that it could be used to make an artifact.
And his last reward as of yet from clearing the fifteenth floor with everyone was another Unique rank item, "Cloak of Shadows".
