Challenge leagues are a great opportunity for a fresh start in a new economy. All of your old characters and items are still present in the Standard and Hardcore leagues, but you're encouraged to join the new leagues, complete challenges and demonstrate your mastery of Path of Exile!

With 3.4.0, there are Standard and Hardcore, and Solo Self-Found Standard and Hardcore, variations of the Delve challenge league available. They have the same core mechanics and items. In the Delve Challenge League, you will delve into the Azurite Mine's infinite depths to extract treasure and discover its subterranean secrets.

And then, In this expansion, Path of Exile reworked three existing skills: Caustic Arrow, Static Strike, and Dominating Blow.

Caustic Arrow:

Caustic Arrow is a bow attack that fires an arrow dealing chaos damage and exploding in a caustic cloud. Enemies standing within it receive a debuff that deals chaos damage over time. The caustic cloud does not poison and is therefore not affected by poison-related modifiers.

Now deals damage in an area around the targeted location, before leaving a lingering patch of Caustic Ground which deals Chaos damage over time. As Caustic Ground is a ground type (akin to Burning Ground) it will not affect flying monsters such as Raging Spirits.

Now has a base duration of 2 seconds at all levels.

60% of Physical Damage is now converted to Chaos Damage (previously, Caustic Arrow added extra Chaos damage based on Physical damage).

Now deals 7 base Chaos damage per second at gem level 1, up to 1714.8 base Chaos damage per second at gem level 20.

Static Strike:

Static Strike is a melee attack that strikes your enemies and builds up static energy on you, dealing damage around you when the energy expires.

Now when you hit an enemy with Static Strike, you will gain a buff which causes you to frequently hit nearby enemies with beams, dealing attack damage. The beams deal more damage while you are moving than while you are stationary. The buff can stack up to three times, increasing the frequency with which the beams strike.

Deals 100% of base damage at gem level 1, up to 146% at gem level 20.

Beams deal 60% less damage while stationary, and 40% less while moving. This penalty drops slightly as the gem levels.

Beams can hit up to 4 targets at gem level 1, and up to 6 at gem level 20.

The base buff duration is 4 seconds, and each stack increases the beam's striking frequency (which is every 0.4 seconds) by 10%.

Dominating Blow:

Dominating Blow is a melee attack that applies a debuff which causes the monster to summon a Sentinel under your control when killed. Sentinels copy the mods of the monster it was raised from.

Now when you hit an enemy with Dominating Blow, you will apply a debuff for a short duration. If a non-unique enemy dies while affected by the debuff, its corpse will be consumed, and a Sentinel of Dominance minion with the same rarity and mods will be summoned.

You may have up to 9 Normal-rarity, 3 Magic-rarity, and 1 Rare-rarity Sentinel of Dominance.

Attacks against Unique enemies have a 10% chance to summon a Normal-rarity Sentinel of Dominance.

Deals 140% of base damage at gem level 1, up to 172% at gem level 20.

Base debuff duration is 1 second and base minion duration is 20 seconds at all gem levels.