The Soul Shrine is the other new location for Final fantasy VI Advance. You can access it, after you defeat the game, and defeat the Kaiser Dragon. The completion of this area will award you the key item Master's Crown. And what does this do you might ask? Not a single thing! It is similar to the Omega Badge won in Final Fantasy V. It is simply to say you did it. But there is still reasons to do it. You can gain the rare items from one time fights, complete your bestiary, and just see if you can actually do it.
You will be placed into a series of 10 battle sets, consisting of varying amounts of fights. After each set is complete, you are given a break. At this time you can use healing items and such, to restore your party. If you leave before completing all 10 sets, you will have to start over again when you return. So make sure you are well prepared. The four characters you choose are of no matter. I will say I chose Terra above all others cause of the Dragon's Den Skull Dragon. when tranced, she will do over 1000 HP damage with each cast. With her Celestriad, she will pop 2000+ on each turn. Otherwise I went with this setting, and this is what they wore.

Terra...LV=99 Apocalypse Genji Helmet Genji Armor Paladin Shield Soul of Thamasa Ribbon

Strago...LV=99 Gladius Oath Veil Behemoth Suit Force Shield Soul of Thamasa Ribbon

Edgar...LV=99 Lightbringer Genji Helmet Genji Armor Force Shield Ribbon Master's Scroll

Locke...LV=99 Ultima Weapon Ultima Weapon Genji Helmet Force Armor Genji Glove Master's Scroll

To Keep yourself going in between battles, you will need some items. I would Suggest getting 99 of each of the following items:
Hi-Potion
Phoenix Down
Ether
You will also need up to 5 of each of the items the Glutturns will ask for. Just a heads up if you want to get through those battles unscathed.
With everything you see here, you should be ready to face the trials of the Soul Shrine.
As for magic, make sure everyone knows Curaga, Reraise, Arise, Rasp and Ultima. Rasp is needed for each and every character (as is the rest of the spells) for the Skull Dragon in the Dragon's Den set. If you used my suggestions from the Dragon's Den, everyone should already have all the spells.

If not, it is easy enough to get them. Just visit the desert south of Meranda. And if you do not have, or want to get 4 Ultima weapons, just substitute them for the best weapons you have. You should still have one however. Be sure to equip that on the strongest fighter. This should be Edgar, but you might have beefed another up while leveling them up.
Once you are ready, head for a island west of Mobliz. (this is where you found Terra and the children. It will be like the dragons den, in you will not land, just appear there. But unlike the Dragon's Den, you will need to create your party before hand. When you land, go inside. There you will be in a room similar to Cyan's dream world. Go up, and talk to the spirit there. He will give you the rules of the Soul Shrine. When he is done, you may begin by speeking to him again. This is also how you start each new set of fights.

Be warned now, there is no space between the individual fights. You will go from one right into the other, until the set is complete.
Inside the Soul Shrine also lies the final four new enemies. They are known as Glutturns. For some reason, they are nowhere in the Bestiary of the game. They look like Magic Urns, but the sprite pallet has been changed. Each of these enemies ask for a certain item, if you do not give them the item, give them the wrong item, or do not run away you will have to fight. They are no pushovers, and they will take your party out if you let them. Still, even if you give them the right item, you can have Locke try to steal from them. Each of them carry a rare item. Here is the Glutturns, what they ask for, and what Locke can steal.

Glutturn
Item Needed	Elixir	X-Ether	Hi-Ether	Ether
Item Stolen	Soul of Thamasa	Master's Scroll	Celestriad	Force Shield
Final Attack	Heartless Angel	Disaster	Blaster	10 Hit

Here is a list of the enemies you fight, as well as the location of these enemies. The Glutturns appear randomly, one per set of enemies until you begin fighting bosses. Guess they thought that would be too difficult. Also it should be noted, that all fights with all enemies in the Soul Shrine are the same as when you encounter them in the game itself. So you can use the same strategies as those battles. Also with Locke with the two Ultima Weapons, and the Genji Glove/Master Scroll combo...most all enemies in the Soul Shrine will die in one turn. (This includes most bosses).

Fight #	Location	Enemies Fought
1	Prologue	Imperial Soldier, Magitek Armor
2	Mount Kolts	Spritzer, Trillium, Zaghrem
3	Lethe River	Exocite, Lesser Lopros, Nautiloid
4	Seige of Doma	Satellite
5	Phantom Train	Living Dead, Oversoul
6	Baren Falls	Opinicus Fish, Rhizopas
7	Phantom Train	Angel Whisper, Cloud, Living Dead
8	Narshe	Hell's Rider
9	South Figaro	Corporal, Heavy Armor
10	West Continent	Iron Fist, Paraladia, Vulture
11	Zozo	Gobbledygook, Veil Dancer
12	Zozo 2	Harvester, Hill Gigas
13	Magitek Factory	General, Onion Knight
14	Magitek Research	Chaser, Trapper
15	Veldt Cave	Death Warden
16	Zone Eater	Baalzephon, Murussu
17	Bomb Forest	Bomb
18	Cyan's Dream	Io
19	Empire	Bug, Fossil Dragon
20	Sealed Cave	Outcast, Zombie Dragon
BREAK
21	Burning House	Balloon
22	Esper Caves	Adamankary, Bonnacon
23	Magitek Research	Mega Armor, Proto Armor
24	Floating Continent	Gigantos
25	Floating Continent	Apocrypha, Brainpan, Misfit
26	Floating Continent	Behemoth, Misfit
27	Floating Continent	Ninja x 2, Platinum Dragon
28	Bomb Forest	Grenade
29	Solitary Island	Land Ray, Peeper
30	Solitary Island	Black Dragon
31	Kefka's Tower	Ahriman, Daedalus
32	Triangle Island	Intangir
33	Kefka's Tower	Vector Chimera
34	Magitek Research	Destroyer, Lenergia
35	Cactuar Desert	Cactuar
36	Dragon's Den	Landworm
37	S. Figaro Cave	Cruller, Humpty, Neck Hunter
38	S. Figaro Cave	Dante
39	Figaro Castle	Dropper
40	East Continent	Borghese, Cloudwraith
41	Umaro's Cave	Tonberries
BREAK
42	Darill's Tomb	Skeletal Horror
43	Darill's Tomb	Exoray, Malboro
44	Doma Continent	Knotty
45	Darill's Tomb	Devil Fist, Punisher
46	Darill's Tomb	Devil Fist, Glasya Labolas, Mugbear
47	Veldt Cave	Gorgimera
48	Kefka's Tower	Great Malboro, Primeval Dragon
49	Narshe	Test Rider
50	Magitek Escape	Magna Roader Large, Magna Roader Small
51	Narshe Mines	Magna Roader Large, Magna Roader Small
52	Owzer's Mansion	Blade Dancer, Crusher
53	Owzer's Mansion	Rafflesia
54	Ebot's Rock	Mahadeva
55	Ebot's Rock	Creature, Sorath, Warlock
56	Ancient Castle	Armored Weapon
57	Veldt Cave	Devil, Enuo, Figaro Lizard
58	Cyan's Dream	Pluto Armor, Schmidt
59	Cyan's Dream	Parasite, Weredragon
60	Cyan's Dream	Alluring Rider, Pandora
61	Zone Eater	Coco, Samurai, Suriander
BREAK
62	Dinosaur Forest	Tyrannosaur
63	Maranda Continent	Greater Mantis, Sprinter, Lycaon
64	Maranda Continent 2	Basilisk, Leap Frog
65	Kefka's Tower	Great Behemoth, Great Malboro, Vector Lythos
66	Thamasa Island	Gloomwind, Purusa
67	Phoenix Cave	Face, Necromancer, Zeveak
68	Phoenix Cave	Clymenus, Necromancer
69	Phoenix Cave	Chaos Dragon, Ouroboros, Seaflower
70	Gogo's Cave	Amduscias, Covert
71	Gogo's Cave 2	Baalzephon, Shambling Corpse
72	Gogo's Cave 3	Kamui, Wartpuck
73	Cultist's Tower	Level 10 Magic, Level 20 Magic
74	Cultist's Tower	Level 30 Magic
75	Cultist's Tower	Level 10 Magic, Level 30 Magic, Level 60 Magic
76	Cultist's Tower	Level 40 Magic, Level 50 Magic, Level 70 Magic
77	Cultist's Tower	Level 80 Magic, Level 90 Magic
78	Cultist's Tower	Magic Urn
BREAK
79	Darill's Tomb	Angler Whelk
80	Zozo	Dadluma
81	Vector	Crane
82	Magitek Research	Number 024
83	Magitek Research	Number 128, Left Blade, Right Blade
84	Glutturn	Elixir Glutturn
85	Airship	Air Force, Laser Gun, Missile Bay
86	Ancient Castle	Master Tonberry
87	Dinosaur Forest	Brachiosaur
BREAK
88	Kefka's Tower	Gamma
89	Kefka's Tower	InnoSent
90	Kefka's Tower	Junk
91	Kefka's Tower	Demon Knight, Yojimbo
92	Kefka's Tower	Muud Suud
93	Kefka's Tower	Fortis, Prometheus
94	Kefka's Tower	Death Machine, Duel Armor, Fortis
95	Kefka's Tower	Cherry, Dark Force, Outsider
96	Kefka's Tower	Mover
97	Kefka's Tower	Fiend Dragon
BREAK
98	Dragons	Ice Dragon
99	Dragons	Storm Dragon
100	Dragons	Earth Dragon
101	Dragons	Gold Dragon
102	Dragons	Skull Dragon
103	Dragons	Holy Dragon
104	Dragons	Blue Dragon
105	Dragons	Red Dragon
BREAK
106	Figaro Castle	Tentacle
107	Darill's Tomb	Dullahan
108	Mobliz	Humbaba
109	Dragon's Den	Malboro Menace
110	Cyan's Dream	Curlax, Laragorn, Moebius
111	Ancient Castle	Samurai Soul
112	Cultist's Tower	Magic Master
113	Ebot's Rock	Erebus, Hidon
114	Airship	Deathgaze
BREAK
115	Kefka's Tower	Inferno, Ketu, Rahu
116	Kefka's Tower	Guardian
117	Kefka's Tower	Demon
118	Kefka's Tower	Goddess
119	Kefka's Tower	Fiend
BREAK
120	Dragon's Den	Ice Dragon
121	Dragon's Den	Storm Dragon
122	Dragon's Den	Earth Dragon
123	Dragon's Den	Gold Dragon
124	Dragon's Den	Skull Dragon
125	Dragon's Den	Holy Dragon
126	Dragon's Den	Blue Dragon
127	Dragon's Den	Red Dragon
128	Dragon's Den	Kaiser Dragon

Once you have completed the Soul Shrine, defeated Kaiser Dragon, and gotten the Master's Crown, you are done. There is nothing more to do here, or in Final fantasy VI Advance. You can go through the Soul Shrine again, or defeat Kefka one more time. If you have not gone after Ultima Weapon yet, now is the perfect time to do so.