In the crowded action RPG genre, most games tie your abilities to your class. Choose a Barbarian in Diablo, and you get Barbarian skills. Choose a Sorceress, and you get Sorceress spells. Your class defines your playstyle from the first level to the last. Path of Exile (POE 1), developed by Grinding Gear Games and released in 2013, rejected this limitation entirely. Instead of class-locked skills, POE 1 introduced the Skill Gem system, a revolutionary approach that separates what you can do from who you are. The keyword Gems defines this system, and it remains one of the most flexible ability systems ever designed.

The Skill Gem system is beautifully simple. Skills are not granted by leveling up. They are not tied to your class. Instead, skills are items that drop from monsters, drop from chests, or are sold by vendors. These gems socket into equipment that has linked sockets. A red gem might grant a melee skill like Heavy Strike or a fire spell like Fireball. A green gem might grant a bow skill like Rain of Arrows or a movement skill like Dash. A blue gem might grant a lightning spell like Arc or a support gem like Faster Casting. Any class can use any gem, provided they have the right socket colors and attributes. A Marauder with enough intelligence can cast Arc lightning. A Witch with enough strength can use Heavy Strike. This freedom is staggering. Your class determines your starting location on the Passive Skill Tree and your ascendancy specialization, but it does not lock you into a single playstyle.

The true power of the Skill Gem system comes from support gems. A skill gem is functional on its own, but support gems modify and enhance it. Linking a support gem to a skill gem changes how that skill behaves. Faster Projectiles support makes your arrows or fireballs travel faster and farther. Greater Multiple Projectiles support makes your spell fire five additional projectiles but reduces their damage. Spell Echo support makes your spell repeat an additional time. Elemental Focus support makes your spell deal more elemental damage but prevents it from igniting, shocking, or freezing. A single skill can be supported by up to five support gems in a six-linked item. Finding a six-linked item with the right socket colors for your build is a major endgame goal. Combining the right support gems transforms a basic skill like Fireball into a screen-clearing machine that shoots nine projectiles, returns to you, forks into additional projectiles, and leaves burning ground.

The second keyword that defines Path of Exile is Tree. No discussion of POE 1 is complete without mentioning the Passive Skill Tree, a massive constellation of over 1,300 nodes that every character shares. The Skill Gem system and the Tree work together seamlessly. Your choices on the Tree determine which attributes you have, which damage types you scale, and which keystones you take. Your Skill Gems determine how you deliver that damage. A build focused on the Chaos Inoculation keystone, which sets your life to 1 but grants chaos immunity, will likely use energy shield gear and spell gems that benefit from intelligence. A build focused on the Resolute Technique keystone, which makes your attacks never miss but never crit, will use attack gems and ignore critical strike nodes on the Tree. The synergy between Gems and Tree creates thousands of viable builds. A single class like the Shadow can be built as a poison trapper, a critical strike dagger assassin, a summoner, or a spellcaster. The only limit is your imagination.

Path of Exile 3.28 Currency is not a casual game. The Skill Gem system requires planning. The socket system requires farming or crafting. The Tree requires research. But for players who invest the time, POE 1 offers unmatched freedom. The Gems do not judge your class. They only ask what you want to build. That is true player empowerment. And more than a decade after release, no other action RPG has done it better.