Emblems are permanent achievement bonuses used to power up your character. They are earned by collecting a specific number of emblem marks that can be traded for an emblem.
How to Earn Emblem Marks
To obtain emblem marks, you first need to unlock the emblem dungeon by reaching stage 6-20, then you need to clear the emblem dungeon. You will earn marks and some diamonds on your first clear, then you can sweep the dungeon to obtain the same number of marks as the previously cleared dungeon.
How does the Dungeon Work
Similar to other dungeons in the game, you need to defeat enemies within a certain time limit and you need to keep yourself alive.
There are 6 waves of enemies to defeat that spawn in a ring around the room and the enemies can be rather tough as you climb, so it is recommended that you try using defensive pets like the Troll if you keep dying.
You want to use AoE (Area of Effect) spells here to deal the most damage per spell, since there is not much need to chase enemies around the room or to attack from afar.
These are the spells I recommend:
When Should I use my Sweep Tickets?
You should only use your emblem sweep tickets when you can sweep enough times to reach the next emblem goal AND you have reached the highest dungeon stage that you can. You should only sweep enough to reach the next goal then STOP and start saving your tickets again for the next goal.
Sweeping before you reach the next goal will not provide any benefits so it is better to wait until you have cleared higher stages so you can get more rewards out of each sweep ticket, without lacking in emblem progression.