The Boundary is a succession of never ending phases, arriving randomly.
Every four phases, you have to deal with a boss.
The difficulty increases as you go along.
The drops are also better and better.
Good luck !
Opening the Boundary
First you have to open the gates in the North East of the F43 by placing Tarkus Destroyers .
You can find in the F47 floor by killing electric flames.
You have to collect three legendary items :
Orochi
Shield
and give them to a NPC in exchange of the ticket entrance : The replacement.
So you enter The Boundary, giving three shards give you the key :)
Each PHASE random one of the floor outlined below.
You have to kill each monsters to go to the next PHASE.
Each 4 PHASES, you will have a PHASE with a boss.
The difficulty increases as you move forward
The entrance ticket (the replacement) could be obtain at F50 with three shards
Upgrade items
Poetic Fiend
Seryi Volk
Orochi
Trinity
Skull wheels ring
"The Platform"
Each 5th PHASE, you come back to this platform like when you arrived.
The first time there is a Gate to F38, next time you'll have a monkey.
There are two vendors on the left, one for boosts, one for puppets and potions.
You also have here your shared chest
The NPC Uruka, Queen of Nightbreed asks for Ring plus a map
The NPC Avenant asks for a star
"Boundary town"
At the North West there is a a basin to put a Spirit Flame in it and another one after the big house.
When putting the Spirit Flame There is a NPC asking for Tutty Fruit
When giving him the Fruit, Uruluc appears and gives a Nightbreed hidden key for Myiyako
Uruluc gives a kind of letter and is always in The Town :
South Est, another NPC asking for a star
The boss is The Avenger :
The Maze
There are DaggerMaster, AxeMaster and SwordMaster here.
With the boss The Avenger:
Same boss as in the F39, but harder
"Boundary night"
A door can be opened in the West with a star, with the red vampire Mark. Inside there are several coffins like in F14 Vampire's room, and with a timer.
A little further iat East there is a prison , can be opened by a star, NPC characters change.
ZOMBIED VAAN
normal vendor
KWAIGOR
South of it, there is a kind of grave with lanterns, bring Poetic Fiend here
The boss is Carmilla
"Boundary cave"
A NPC is asking for dynamite, when you give him, it opens a path with a rock. Inside you have a boost.
At the East, there is two NPC One asking for a star, the other for a Shard.
the places of the big blocking rocks change.
"Boundary grass"
North of it you can open a door with a star.
It could be battle of creatures or MIMICS …
And at the end a reward:
Near the princess is asking for a star too.
The boss is Carrion Bloom
"Bondary Iron"
There are cutting wheels coming out from doors with limited timelife.
Walls emplacement are random.
There is sometimes a NPC in the east.
And In the west, there is a NPC asking for a Spirit Flame, when given, he starts to build a Golem with a hammer
I had two Iron Golems after that …
The boss is called Iron Mark II or Iron Mark III
Boundary pine
In the north, you need a push button to open a path to a vendor asking for the Red Knight Armor Set King.
When you give the set, KAI appears, killing him gives you a ear
Giving the KAI's ear on F10, gives you the Detonator
Sometimes there is a NPC Summoner:
With a Shard he will sell Stars and Spirit Flame:
There is also a hidden place behind the threes in the west.
Here you need a Spirit Flame to make Nightindale, asking for a Star
He gives you a Tyche Fruit as a reward:
"Boundary Trinity"
In the center of the circle you can place three Flame Spirits
When done the three bosses like in F49 appears …
There is a vendor in north who waits for an Item + Trinity ring
It is also possible to trade a star for a soul flame.