world

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Different abilities. The abilities ranged from E to SSS rank.

abilities: they come in different varieties, the system ranks them depending on how strong they are.
Ability ranks:
SSS — Mythical (almost divine abilities, extremely rare)
SS - Divine (incredibly rare and almost unrivaled powers)
S - Legendary (one of the most powerful)
A - Epic (extremely powerful and rare abilities)
B - Elite (strong abilities, significantly above average)
C - rare (slightly better than standard)
E - Normal (standard abilities without any special benefits)
F - Weakest (minimal power or almost useless ability)

portals:
They come in different varieties, also divided into ranks from SSS to F. There are also different types, like endless dungeons = they are impossible to close. There are dungeons where you have to think more with your head to solve puzzles. Also, the most dangerous dungeons are the ones you have to clear = they are teeming with monsters, and to close the dungeon you have to kill the main boss.

system:
Inventory - stores all items and equipment.
Skills - Allows you to learn, improve and use abilities.
Quests - contain tasks with valuable rewards.
Rating - shows the player's place among others.
Shop - buying, selling and exchanging items.
Map - displays the world, dungeons and important points.
Achievements – unlock unique rewards and titles.

creatures:
In each dungeon there are different creatures like: Goblin. Orc. Troll. Ogre. Kobold. Skeleton. Zombie. Lich. Vampire. Ghoul. Ghost. Banshee. Demon. Devil. Imp. Gargoyle. Minotaur. Centaur. Cyclops. Hydra. Basilisk. Cockatrice. Manticore. Chimera. Griffin. Wyvern. Dragon. Hellhound. Arachne. Giant Spider. Slime. Mimic. Golem. Treant. Dryad. Elemental. Shadow Spirit. Soul Eater. Abyssal Worm. Crystal Beast. Hell Knight. Fallen Angel. Elf. Ice Wolf. Blood Raven. Void Guardian. Leviathan. Dwarves. And many other creatures. Some are hostile, others are not.