Path of Exile’s latest expansion, Sentinel, is now available on PC and macOS. The expansion kicks off a new Challenge League in the free-to-play PC game, with the core mechanic being customizable sentry balls that follow the player to fire beams of magic at enemies. But Sentinel isn’t meant to make players’ lives easier — quite the opposite, in fact. Their beams empower monsters and create tougher fights for players. If you want to have a pleasant experience in the game, you can buy more POE Currency to help you get started better.

In Sentinels Challenge League, players will Buy POE Currency three types of Sentinels scattered around Wraeclast. Once the player enters combat, Stalker sentinels will repeatedly fire monster-boosting beams. Pandemonium Sentinel fires a massive explosion that empowers monsters in a large area. Then there are apex sentinels, which will only charge up unique enemies.

Although Sentinel only works for a limited time and will eventually run out of battery, players don’t want to throw away their own empty bottles. A depleted Sentinel can be combined with an Energy Core to create a new, fully charged Sentinel with the characteristics of each Sentinel shell used in its construction. Players can further tweak the Sentinel’s behavior using Sentinel Controller, which Grinding Gear Games says is “like a rune circuit board.” If you want to strengthen yourself, you can read the news written by POECurrency and buy POE Currency.

The tradeoff of fighting stronger monsters? Well, with the POE Orbs on a player’s Sentinel, the monsters they grant will drop tastier and rarer rewards. Players will also find some unique Sentinels with their own effects to experiment with and tinker with.

Sentinel expansion also adds 20 new cornerstone passives to Atlas tree, which means players will have more control over Path of Exile endgame. This includes access to six new “Super” versions of the pinnacle boss fights, which Grinding Gear Games says are the toughest additions to the game.