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Labyrinth of Touhou 2/Dungeons/Infinity Corridor

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 Labyrinth of Touhou 

Infinity Corridor

Overview

Once you've obtained the Seven Star Seal on 21F and triggered the event at the end of B4F, you will be able to enter this dungeon from Gensokyo directly (but not from B4F). It is a procedurally generated dungeon that is, per the name, infinite in length. You will be able to obtain a variety of items within the dungeon, which includes equipment, boosting items, certain materials which are available nowhere else, and infinity gems which you can use as a currency to buy more stuff from Akyuu with. You will also be able to obtain special Awakening items which allow your characters to unlock and learn new, powerful skills.

  • There's a time limit in the form of your 7-Star Amulet counter, which has two parts; the left side starts around 150~200 for each floor and can be increased by events, while the right side rises with every battle you win. Each step lowers the counter by one (from the left side first, until it hits 0), and some events also consume it. If both counters hit 0, you will be forcibly ejected from the dungeon. Since the M key still works here, you should not run out unless you forget or choose to do so.
  • There's also a durability counter, which serves as a hard time limit - it will always start at 400 at the start of a floor, lowers by 1 per step, and cannot be replenished in any way. You will be forcibly ejected if it hits 0 as well, but 400 should be more than enough to explore the entire floor.
  • You can find the following events inside the dungeon:
    • Green icons denote sealed items. These can be opened at the cost of your amulet counter, or with an Infinity Key. You can also forcibly unseal it for free, but this usually greatly decreases the item quality. Sealed Item quality ranges from 1! to 5!, with higher quality requiring more of your counter to open, and usually resulting in better items. You can obtain both main and sub equipment (which for high level seals can result in items all the way from the 12th page, with 500+% stat boosts), as well as stat gems/jewels, boost tomes, crafting materials, and infinity gems. Occasionally the item won't be sealed at all, allowing you to obtain it for free.
    • 1! and 2! rank chests mostly contain low-grade equipment, gems, and tomes. Starting at 3! rank, the chance of endgame crafting materials greatly increases, and 4! rank starts to regularly give out worthwhile equipment. Rank 5! chests almost always give high rank items or crafting materials, including a chance at the most powerful equipment such as Quartz Charms or Tokugawa Statues. Even forcibly opened rank 5! chests have a decent chance to give out items such as veteran tomes.
    • Yellow glowing icons denote a light source, which can be used to reveal a large amount of the floor. Doing so will cost 10% of your left-side counter, but you can still use them when it is 0 (and illuminate the area for free). The revealed map will generally save more counter than it costs to use.
    • Blue glowing icons will give you a number of amulet counters when checked. These will go to the left side of the counter.
    • White glowing icons will give you a number of seven star dust, which will be covered below.
    • Blue icons with two arrows allow you to offer some of your amulet counter to obtain twice as much seven star dust.
    • Purple key icons will give you an Infinity Key to open item seals with. The keys will disappear when you leave the dungeon for any reason.
    • Sometimes upon entering a floor you will be notified it is a "Lucky", "Risky", or "Fever" floor. Fever floors have increased chance of powerful enemies that can drop the rarest corridor material, while Lucky floors greatly increase the EXP and Money bonus at the end of battle, and Risky floors greatly increase enemy level along with the exp and money bonus. It's generally recommended to run from encounters on Risky floors, but be careful not to run out of 7-star counter and get ejected. Aya makes long floor chains vastly safer by allowing you to run before the overpowered enemies of a Risky encounter can wipe the party.
  • After clearing each floor, you will be taken to a "preparation room" before heading to the next floor. All the left-hand side of your amulet counter will be converted to seven star dust (at an 1:1 ratio), and you can interact with the middle orb to trade them for all sorts of items. There will also be four other orbs which can offer you boons - these can be instant MP or TP restores, or buffs to ATK/DEF, MAG/MND, or SPD which will remain for several floors. There are also boosts to exp, money, item drops, MP recovery after battle, or a chance to not consume TP. You may only pick one of the four choices. Note that seven star dust will also disappear once you leave the dungeon, and the best equipment you can trade them for require a very high amount of dust count. If you want to aim for them, you should be prepared to explore up to 50 floors without leaving.
  • After clearing a floor, the game may give you an Infinity Stone, ostensibly for "obtaining all treasures on the floor". However, the game actually checks all 1! chests, light source icons, and amulet to dust conversion icons. You will get the bonus stone if you clears out all icons of those varieties.
  • At the preparation room after every tenth floors, there will be a boss guarding your way to the next floor. Defeating the boss will reward you with either Equipment (non-Shadow bosses) or a Greater Gem of Awakening (Shadow Bosses), and Akyuu will start selling you awakening items in exchange for the latter - each character has their own awakening item, and obtaining one will unlock extra skills for them to learn. You will not be able to trade away your last Gem. You can also get extra copies; each additional copy will cause that character to deal 1% more damage and receive 0.5% less damage, up to a maximum of 50 copies (50% extra damage dealt and 25% reduced damage received). Additional copies of awakening items may be bought for 12 Infinity Gems in Akyuu's shop after the first is obtained.
  • It's worth noting that, once you clear a floor, you will never be able to visit that floor again - you will always start from the highest floor you have visited. This can cause complications if you're looking to clear multiple floors in one run (so you can get the items from exchanging dusts). You may wish to save before you attempt such a run, so you can reload back to your earlier progress if you fail.

It's also important to keep in mind that there are many benefits to clearing a lot of floors in a single Corridor trip beyond simply saving up for the shop. These effects increase along with the size of your floor streak.

  • Blue and white ! events will sometimes grant nearly twice as many amulets/dust as normal, and Exchange events will sometimes grant triple dust instead of double. A large enough streak will guarantee these bonuses.
  • Risky/Lucky floors will have larger modifiers, eventually always granting the maximum bonus.
  • Sealed items seem to be unsealed somewhat more often.
  • Once you unlock the Dust Stock feature (which makes some of your dust persist on leaving the corridor, whether by choice or by death), it grants 1% more dust conversion per streaked floor, maxing at 25% dust conversion rate.

Unfortunately, the level of random enemies (but NOT boss fights) rises faster while streaking - each consecutive floor clear adds about 0.5% to their levels. When your streak ends, they will be at their normal level next time you enter the Corridor, so there is no long-term penalty.

Sometimes, as you progress further, you may run into a rock right before a boss fight. These rocks will have certain requirements that forces you to complete some tasks within the Great Tree.

  • 60F - Recruit all party members.
  • 100F - Have all 56 Dark Fragments.

Enemies

The enemies you can run into will scale with the floor you're currently on; they start at about level 190-210 and will steadily increase from there. You can run into a very great variety of them, but they are generally just blue-hued variants of enemies you have encountered (or will encounter) in the main dungeon. These include some boss/FOE rehashes as well as powerful monsters from plus disk floors; these monsters can drop any of the four materials exclusive to the corridor (where as normal monsters can only drop up to three kinds). They generally keep the same resistances and weaknesses as their proper version as well. Because you can't predict what you will run into, you will just have to be prepared for everything.

Bosses