Originally Posted by
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Tower Quest is largely a competition; you're clearing the floors of a tower to get tower medals (via quests/missions and clear time). Then you get ranked against other players on how many tower medals you acquired. The prize is more tower medals :P (and some jewels if you place high enough)
The medals themselves are a currency for a new exchange. There's a lot of stuff in that exchange, with the highlight being the SSR weapon limit break item (that thing that costs 20 draconic eyes otherwise).
The main gimmick is that kamihime you use get disabled for three rollovers/maintenances, so you'll need a lot of kamihime by then. Shouldn't be too hard to have a pile of fodder Rs and SRs at least.
If I understand it correctly, it also uses a limited entry system instead of AP/BP. 2 keys a day over 8 days, with 1 key being consumed per attempt. No elixir usage allowed.
The floors themselves start easy then scale up. For example, in the first tower quest event, the 2nd floor has 40k HP enemies. The 15th (last) floor has 900k-1.5 million HP grunts and the 8 million HP boss.
Oh, and 1/3 of the quests are 'clear this with only X element'. Assuming that the people gunning for the top spot want to clear every quest, they'll need a water crew for the one in December, then a thunder crew for the one next February/March. Also, those people cannot afford to fail even once (floors 1-14 need to be cleared once, but 15 requires two clears).
For the rest of us who don't really care about aiming for the top, don't worry too much about mono-element or whatever. Just get what you can.