So I'm currently trying to muster up the stamina and courage required to venture into the depths of the Survival Dungeon. However, before I begin, I need to know just what I'm getting into and confirm that it's actually worth the effort. How many floors are in the Survival Dungeon, and what am I rewarded with if I successfully complete all of them?
The Survival Dungeon is a 60 floor dungeon that randomly selects levels from the Terran Ruins, the Ignan Ruins, the Aquan Ruins, and the Zephyran Ruins. You will encounter a boss at every 10 levels. On the 10th, 20th, 30th, 40th, and 50th floors, defeating the boss will yield a shop and a treasure chest. The shop sells food items to heal (subject to the same price hikes as normal shop items, so keep that in mind). The treasure chest will contain a unique item (or a Thankful Statue if you've already gotten that item). Progressing to the next level is done by opening the chest, so shop first if you're going to buy anything.
Below are what you'll get on each floor.
Additionally, in the shops on the 40th and 50th floors, you can purchase the Divine Staff, a Staff that gives +70 Magic Attack. It's the most powerful staff in the game, so don't forget to visit the shop on those levels!
The 60th floor is a unique boss fight that is only available in the Survival Dungeon. You do not get a treasure chest or shop after defeating it, clearing it merely gives you completion of the dungeon. However, there is a special item only gotten on the 60th floor, as follows.
One last little thing you can find in the Survival Dungeon. The bosses of the 10th and 30th floors are randomly selected from the first four bosses of the game. However, on the 30th floor, this encounter is a Shadowy version of the boss that is more powerful. This is only noteworthy for this question in that the Shadow version of the Aeolian Wyvern has a chance to drop the Treasure Black Horn when one of its horns is broken. Thankfully, it is not required to obtain for anything other than being a completionist.
There are 60 floors in the Survival Dungeon, with a boss and reward every tenth floor. The rewards are as follows (source):
Floor 10: Wind Crest -- Increases chances of getting wind gems