Tartarus unlocks at lvl 22 with 5 boss at each stage, new stages will open at levels 37, 47, 57, 67, 77.
Every boss consume 20 STA , if you lose or quit attempt won’t consume STA .
Only 1 free attempt for challenging a single boss but you can reset them for diamonds .
You can blitz the boss if you defeated that boss before with 3 star .
You can ask for help from friends to kill the boss using SOS . For helping you , your friend will get mount card and magic jewel .
You may send out a total of 5 SOS per day, 1 SOS per friend.
Each boss drops/reward you if you kill him .
Level 20 forging jewels unlocks at level 22
Level 40 forging jewels unlocks at level 37
Level 50 forging jewels unlock at level 47
Level 60 forging jewels unlocks at level 57
Level 70 forging jewels unlocks at level 67
Level 80 forging jewels unlocks at level 77