The first Instance Dungeon to be released in Fiesta, Iyzel Tower is located on the south-west corner of the Forest of Mist map.
The goal while in the tower is to kill all the monsters on each floor. As you kill all the monsters on each floor, a guard will tell you that it's time to move on to the next floor. You will notice as you begin a floor, the door leading to the next floor is blocked by a thick smoke. This smoke will disappear when you kill all the monsters on the floor. As you you work your way through the tower, the monsters will get tougher and you will face the bosses.

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Level Requirement: 20-50

Entrance to the Dungeon

Path to the Boss

Strategy:
It's always good to go in with a full party. A good party would consist of at least 2 clerics, a mage or archer, and a high level fighter. Fighters are crucial in tanking the bosses while archers or mages are good at attacking from long distance and making the monsters bleed or get poisoned. You can survive with a party of three. As long as you have a cleric and two other classes who can fight, you will survive. Note that without a fighter, you may have to use up the entire tower to kill the last two bosses because you won't be able to kill them in one spot as they will spawn Monsters to Kill/Items to Get you. With a fighter, it will be easier but you may have to move down the tower and make the boss chase you before it is safe to kill it.
Depending on what level you are, as you go higher into the tower, some monsters won't be easy to kill. You will have to lure one or two monsters at a time before killing all of the monsters on the floor.
Here are screenshots of each floor along with information of the monsters/bosses and quests.

Note that before you enter a floor, each floor has a number:

When you pass through the archway before going to fight the monsters on each floor, on the right hand side on the wall are Roman Numerals. These Roman Numerals will tell you what floor you are on. The floor you start at once you spawn into the tower is NOT a floor. That's the base of the tower. The first floor of the tower is where you start fighting the first monsters.
When you are browsing through this guide, be aware that this guide starts on the first floor you kill monsters on. The quest name will state the floor number as it would appear when you include the base floor of the tower that you first spawn at. So for instance the second floor will have a quest name stating that the second floor is the third floor of the tower.

First Floor

Monsters: Iyzel Gang Imp (lvl 16) and Iyzel Imp (lvl 15)
Quest:
Name: Tower of Iyzel 2nd Floor
Level: 20
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Iyzel Imp (6), Iyzel Gang Imp (4)
Rewards: 6096 EXP, 874 copper, 45 Fame

Second Floor

Monsters: Iyzel Ratman (lvl 17) and Iyzel Hungry Wolf (lvl 18)
Quest:
Name: Tower of Iyzel 3rd Floor
Level: 21
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Iyzel Hungry Wolf (2), Iyzel Ratman (2)
Rewards: 8792 EXP, 1 silver 27 copper, 49 Fame

Third Floor

Monsters: Iyzel Boar (lvl 18) and Iyzel Kebing (lvl 19)
Quest:
Name: Tower of Iyzel 4th Floor
Level: 21
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Iyzel Boar (3), Iyzel Kebing (2)
Rewards: 10990 EXP, 1 silver 27 copper, 49 Fame

Fourth Floor

Monsters:

• Iyzel Iron Slime (lvl 20)
  
• Dust Golem (Boss) (lvl 25)
  • Summons 3 times consisting of mobs on the previous floors
    
  
  

Quest:
Name: Iyzel, Beginning of Chaos
Level: 22
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Dust Golem (1)
Rewards: 13690 EXP, 1 silver 180 copper, 53 Fame

Fifth Floor

Monsters: Iyzel Skeleton Archers (lvl 21)
Quest:
Name: Tower of Iyzel 6th Floor
Level: 23
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Iyzel Skeleton Archer (4)
Rewards: 14884 EXP, 1 silver 333 copper, 57 Fame

Sixth Floor

Monsters: (Destroy the statue)

Seventh Floor

Monsters: Iyzel Skeleton Archer (lvl 24) and Iyzel Skeleton (lvl 25)
Quest:
Name: Tower of Iyzel 8th Floor
Level: 24
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Iyzel Skeleton Archer (4), Iyzel Skeleton (2)
Rewards: 16528 EXP, 1 silver 486 copper, 61 Fame

Eighth Floor

Monsters: Iyzel Archmage Book (lvl 27), Iyzel Skeleton Warrior (lvl 29), and Iyzel Skeleton Archer (lvl 28)
Quest:
Name: Tower of Iyzel 9th Floor
Level: 25
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Ripped Pages (2), Iyzel Skeleton Archer, Iyzel Mage Book, Iyzel Skeleton Warrior
Rewards: 17590 EXP, 1 silver 639 copper, 65 Fame

Name: Collection
Level: 26
NPC: Lord Elbama (Elderine)
Monsters to Kill/Items to Get: Iyzel Skeleton Warriors Weapon (1)
Rewards: 24331 EXP, 1 silver 792 copper, 63 Fame

Ninth Floor

Monsters:

• Iyzel Archmage Book (lvl 30)
  
• Iyzel Flying Staff (lvl 31)
  
• Iyzel Stone Golem (Boss) (lvl 35)
  • Summons 3 times consisting of mobs on the previous floors
    
  
  

Quest:
Name: Iyzel, Acceleration of Chaos
Level: 27
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Stone Golem (1)
Rewards: 36664 EXP, 1 silver 945 copper, 73 Fame

Tenth Floor

Monsters: Iyzel Fox (Lvl 32) and Iyzel Wild Wolf (lvl 33)
Quest:
Name: Unexpected Event
Level: 28
NPC: Enchantment Master Wishis (Elderine)
Monsters to Kill/Items to Get: Wishis Wand (1)
Rewards: 30839 EXP, 2 silver 98 copper, 77 Fame

Eleventh Floor

Monsters: Iyzel Zombie (lvl 34)
Quest:
Name: A Work Unwilling to Do
Level: 29
NPC: Lord Elbama (Elderine)
Monsters to Kill/Items to Get: Red Liver (1)
Rewards: 31680 EXP, 2 silver 251 copper, 81 Fame

Name: Tower of Iyzel 12th Floor
Level: 30
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Iyzel Tomb Fox (3), Iyzel Wild Wolf (3)
Rewards: 44097 EXP, 2 silver 404 copper, 85 Fame

Twelfth Floor

Monsters:

• Iyzel Ice Vivis (lvl 40)
  
• Poison Golem (Boss) (lvl 45)
  • Summons 3 times consisting of mobs on the previous floors
    
  
  

Quest:
Name: Tower of Iyzel 13th Floor
Level: 31
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Iyzel Zombie (4)
Rewards: 59959 EXP, 2 silver 557 copper, 89 Fame

Thirteenth Floor

Monsters: Iyzel Spider (lvl 42) and Iyzel Prock (lvl 41)
Quest:

Fourteenth Floor

Monsters: Iyzel Spider (lvl 43)
Quest:
Name: Tower of Iyzel 15th Floor
Level: 35
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Iyzel Prock (2), Iyzel Spider (3)
Rewards: 102341 EXP, 3 silver 169 copper, 105 Fame

Fifteenth Floor

Monsters: Iyzel King Spider (lvl 43)
Quest:
Name: Tower of Iyzel 16th Floor
Level: 36
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Iyzel King Spider (3)
Rewards: 137577 EXP, 3 silver 322 copper, 109 Fame

Sixteenth Floor

Monsters:
Quest:
Name: Tower of Iyzel 17th Floor
Level: 37
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Sticky Cobweb (1)
Rewards: 141409 EXP, 3 silver 475 copper, 113 Fame

Seventeenth Floor

Monsters:
Quest:
Name: Tower of Iyzel 18th Floor
Level: 38
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Iyzel King Coll (3)
Rewards: 165924 EXP, 3 silver 628 copper, 117 Fame

Eighteenth Floor

Monsters:
Quest:
Name: Tower of Iyzel 2nd Floor
Level: 20
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Iyzel Imp (6), Iyzel Gang Imp (4)
Rewards: 6096 EXP, 874c, 45 Fame

Nineteenth Floor

Monsters:
Quest:

Twentieth Floor

Monsters:
Quest:

Twenty-first Floor

Monsters:

• Iyzel Magic Staff (lvl 50)
  
• Iyzel Iron Slime (lvl 51)
  
• Iron Golem (Boss) (lvl 55)
  • Summons 3 times consisting of mobs on the previous floors
    
  
  

Quest:
Name: Tower of Iyzel 20th Floor
Level: 39
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Iyzel Flying Staff (5), Iyzel Iron Slime (5)
Rewards: 222284 EXP, 3 silver 781 copper, 121 Fame

Name: Jet-Black Purity
Level: 40
NPC: Ancient Templar Maria (Roumen)
Monsters to Kill/Items to Get: Black Heart (1)
Rewards: 285000 EXP, 3 silver 934 copper, 125 Fame