Demon's Portal in Light World
Starting at level 99, you gain access to the Demon's Portal, a special dungeon.
The Demon's Portal can be entered once a day to fight against an extremely difficult enemy.
The enemy always regenerates its health by 10% at midnight.
Defeating the enemy is worth it because with each defeated opponent you get a permanent bonus of 1% to your hit points. As there are 50 enemies to defeat you can achieve a maximum bonus of 50% through the Demon Portal.
Demon's Portal in guild
If you've been a member of a guild for at least 24 hours and have reached at least level 99, you can enter the Demon's Portal in the guild once a day and fight the enemy there.
The enemies are extremely difficult and the entire guild fights them. The hit points that are drained from an opponent in each fight apply to all players in the guild.
The hit points of the opponent always regenerate by 10% at midnight. If an opponent is defeated, all players in the guild will permanently receive 1% to their damage. As there are 50 enemies to defeat you can achieve a maximum bonus of 50% through the Demon's Portal.
New guild members will automatically receive the missing guild portal stickers in their scrapbook after being in the guild for 21 days.