themselves to level up and increase in potency. Active skills can be modified by items known as Support Gems. Depending upon the number of linked sockets the player possesses, a primary attack or skill can be modified with increased attack speed, faster projectiles, multiple projectiles, chaining hits, life leech, auto-cast spells on critical strike, and more. Given limits on the number of sockets, players must prioritize gem usage. All classes share the same selection of 1,325 passive skills, from which the player can choose one each time their character levels up, and as an occasional quest reward. These passive skills improve the core attributes and grant further enhancements such as increased Mana, Health, damage, defenses, regeneration, speed, and more. Each one of the characters start on a different position on the passive skill tree. The passive skill tree is arranged in a complex network starting in separate trunks for each class (aligned with the permutations of the three core attributes). The player must therefore not only focus on maximizing all modifiers related to their primary offense and defense, but must also take care to select the most efficient path through the passive skill tree. As of the 3.0 Fall of Oriath Release, the maximum possible number of passive skill points was 123 (99 from leveling and 24 from quest rewards). Each class also has access to an Ascendancy class, which grants much stronger, specialized bonuses. Each class has three Ascendancy classes to choose from, except for the Scion, who only has one Ascendancy class that combines the elements of all other Ascendancy classes. Up to 8 Ascendancy skill points can be assigned out of 12 or 14. Path of Exile is unusual among action role-playing games in that there is no in-game currency. The game's economy is based on bartering "currency items." Unlike traditional game currencies, these items have their own inherent uses (such as upgrading an item's rarity level, rerolling affixes, or improving an item's quality) and thus provide their own money sinks to prevent inflation. Most of these items are used to modify and upgrade equipment, though some identify items, create portals to town or grant skill refund points. Leagues The game offers several alternate play modes. The following permanent leagues are available: Standard – The default gameplay league. Characters who die here respawn in the last city visited (with experience loss at higher levels). Hardcore (HC) –