Quests

The main core of progression is grinding for better gear while doing quests. A differential here is that you can redo all quests once their cooldown is gone, being able to get the same quest reward (being it random or not) more than only once.
You can check your current cooldown by using the command !quests, or clicking on this client button right here:

Since there are many quests on Zoltyum, I made some walkthrough videos that can help you with quest mechanics.
Remember that this is a nice way to farm Jewels aswell.

Nocturnia Quests

Rookie Quest and Promotion Quest

• Level Required: None (Recommended 50+ with a team)
• Rewards: Rookie Equipment, Promotion, and a Quest Reward Chest.
  
• Link: https://www.youtube.com/watch?v=0dUZwKqbd70

Gladiator Quest

• Level Required: None (Recommended 100+ with a team)
• Rewards: Gladiator Gear, Gladiator Weapon, Pirate Addons, and a Quest Reward Chest.
  
• Link: https://www.youtube.com/watch?v=rUolo0My3vE

Hardbone Quest

• Level Required: None (Recommended 200+)
• Rewards: 15x Jewel, Random Hardbone Equipment/Weapon, Summoner Addons, and a Quest Reward Chest.
  
• Link: https://www.youtube.com/watch?v=5UpYG0Vaq7U

Minotaur Quest

• Level Required: None (Recommended 300+)
• Rewards: 15x Jewel, Random Minotaur Equipment, and a Quest Reward Chest.
  
• Link: https://www.youtube.com/watch?v=a05x99I1cSQ

Pits of Inferno Quest

• Level Required: None (Recommended 400+)
• Rewards: 20x Jewel, Pits of Inferno Weapon of your choice, Frozen Starlight (Ammo slot), Backpack of Holding, Soft Boots, and a Quest Reward Chest.
  
• Link: Not recorded yet.

Hellcore Quest

• Level Required: 500
• Rewards: 20x Jewel, Random Hardbone Equipment, and a Quest Reward Chest.
  
• Link: Not recorded yet.

Inquisition Quest

• Level Required: 600
• Rewards: 20x Jewel, Random Inquisition Equipment/Weapon, and a Quest Reward Chest.
  
• Link: Not recorded yet.

Hoelbrak Quests

Battleplated Quest

• Level Required: None (Recommended 800+)
• Rewards: ?x Jewel, Random Battleplated Equipment.
  
• Link: Not recorded yet.

Pirate Quest

• Level Required: None (Recommended 800+)
• Rewards: 125x Jewel, Random Ammo Slot Doll or Third Relic Slot Unlocker.
  
• Link: Not recorded yet.

Soulforged Quest

• Level Required: None (Recommended 800+)
• Rewards: 140x Jewel, Random Soulforged Equipment.
  
• Link: Not recorded yet.

Hoelbrak Quests

Glaciersteel Quest

• Level Required: None (Recommended 1050+)
• Rewards: ?x Jewel, Random Glaciersteel Equipment.
  
• Link: Not recorded yet.

? Quest

• Level Required: ?
• Rewards: ?x Jewel, ?.
  
• Link: Not recorded yet.