The Helltide event is one of Diablo IV gold the most efficient ways to farm Horadric Vials. These timed regional events increase monster difficulty, enemy density, and reward quality. While inside a Helltide zone, you can earn vials through several mechanics:

Collect Anomalous Embers: Use these to open special Helltide chests scattered across the map. These chests often contain Horadric Vials and other valuable loot.

Raise Your Threat Level: Staying active in the Helltide will increase your threat, eventually summoning elite mini-bosses that drop better rewards, including vials.

Use Baneful Hearts to Summon the Bloody Maiden: This powerful enemy has a high chance of dropping multiple Horadric Vials when defeated.

Engaging in Helltides regularly will keep your vial supply growing steadily.

The Grim Favor system is another reliable way to obtain Horadric Vials. Completing ten Grim Favors allows you to redeem a cheap Diablo 4 Items reward cache from the Tree of Whispers. These caches often include Horadric Vials among other upgrade materials, gold, and gear. It's a great option for players at all levels, and especially helpful between major world events like Helltides.