In order to fully explore Ice Cave, you will need to collect monster medals for 155 monsters. For each monster, you can either collect a Bronze and Silver medal, or alternatively just collect two Bronze medals and then trade them for a Silver with the old man in the cave. Either way it takes a very long time, but getting two Bronze should still be quite a bit faster than trying to get both Bronze and Silver.
Once you had the secret Wish by Divinegon fulfilled, then you can go to Leiamland Shrine. There a new Warp will be created where the Egg was. On the first floor, random enemy encounters can include several of the game's previous bosses, as well as other hard-or-otherwise-impossible-to-find enemies such as Template:~ and Template:~. This is actually important, because these random encounters will allow you to obtain some of the necessary monster medals to pass through the subsequent gates within the Ice Cave.
| Monsters in Ice Cave |
|---|
|
The Bronze Gate
You will find four Chests on this Floor. They contains one Template:~, 
Starry 
, 
Goddess and 
MysticNut.
To get pass the Bronze Gate you need to talk with the old man guarding the Gate and show him proof you've collected all Bronze Medals from 001 until 155. Once you got all 155 Bronze Medals, you can pass the Gate and go to the next Floor.
On the second Floor you will then meet 10 new monsters, never seen before anywhere ingame. Like the Template:~ the tougher brother of Template:~ and Template:~ or 2 new Dragons besides the Green Dragon. Of course asides of the new monsters there are also some known monsters walking around like Template:~ and Template:~.
Before going east go west first to the first of seven Chests found on the second Floor. It has a Life . Now go east and south for another chest with LifeAcorn. At the next crossing go east for a Hero in the chest. Go south and ignore the 3 first branches and enter the left and right branches after that for STRseed and MysticNut.
On the way to the Floor below you find two more Chests with STRseed and Wizard . On third Floor go right to get STRseed from the Chest and go left along before a imposant scenery to the fourth Floor.
The Silver Gate
A old man is guarding the Silver Gate and wants you to show him Silver Medals from 001 until 155. The 10 new monsters aren't included since they carry the numbers 156 until 165. Once you've collected all necessary Silver Medals (or, as mentioned previously, collected two Bronze and used the old man's offer to trade for Silvers), he will let you pass. The Chest in next room contain 
Tiara 
. The Room ahead is like a maze. To get the Tiara from the Chest you have go a long way walking around finding the right path to the Chest. Once you've cleared the maze-like room you will be in a Room with many Warps.
Go first in the lower right room and take the Warp there which lead to a room with the Chest which has 
Ultimate 
. Now take the Warp in the middle room which leads to the Floor below. Some of the Grounds is icy, so you must go around to get crossed on the other Path. Go south first to get 
Lucky 
from the Chest. You will soon come to a icy room. Try to get to the left room with a Chest. It has a STRseed. That is the last Chest found in this Dungon.
Take a deep breath and venture in the last Floor where the boss resides.
GranDragn
GranDragn has 10,000 HP, 3,000 more than Divinegon, so he is stronger than even Divinegon. He possesses Spells just like Divinegon, but you can also use the same Strategy, which worked well against Divinegon, on him too; Spam Thordain and BlazeMost on him and heal yourself with SageRock or Healing Spells until GranDragn is down.
For your Victory over him you will receive 
Rubiss 
which is the strongest weapon ingame and using it as a item you can cast Thordain. If you fight him again and defeat him in under 25 Rounds, then he will hand out a set of medals of himself.