With Destiny 2 Episode: Revenant comes the new Onslaught: Salvation activity, and with it, a new system for crafting special tonics that provide you with lots of different bonuses. These break down into two categories--Volatile tonics, which give you specific combat buffs, and Enriching tonics, which help you tune which rewards you receive from activities like Onslaught: Salvation.

It seems that a lot of the story in Revenant will concern tracking down reagents to make tonics and helping episode vendor Eido with her tonic research in special missions called Fieldwork. But even though you can quickly finish the Act 1 story missions for Revenant right now, it's not particularly clear how you unlock new potions or advance through Eido's activities. Here's what you need to know about how the tonics system works and how to unlock additional Fieldwork.

How To Unlock New Tonic Recipes

Completing the story quests in Revenant Act 1 will lead you through the tonic crafting process, which is generally pretty easy to understand. What's more confusing is what to do to get more tonic recipes and expand your repertoire.

The good news is that unlocking tonics is easy--you just need to craft more tonics. You start with a series of tonics whose icons have green borders, indicating that they're the Uncommon level of rarity you see on weapons and armor. If you craft the green version of a tonic several times (it seems to be about five), you'll unlock its blue version, the Rare rarity. Keep crafting a blue tonic to get the purple, or Legendary, version. So while the game doesn't exactly tell you this, crafting each tonic several times will unlock new recipes.

The trick here is keeping yourself filled up with reagents, the materials you need for crafting tonics. You can earn these from killing enemies and completing activities throughout the solar system, but the best way to get them seems to be from the chests that you get for completing each 10 waves of Onslaught: Salvation.

Completing Eido's Minor Fieldwork quests also reward you with a bunch of reagents every time you knock one out, so it pays to do those as soon as they come up.

How To Unlock New Fieldwork Quests

Eido's Fieldwork quests allow you to find new kinds of reagents and ingredients so you can craft new kinds of tonics, so it's important that you complete them when they become available to keep your tonic progress from stalling.

These are the second step in Eido's progression system--you only unlock a new Fieldwork quest when you have unlocked a certain number of recipes, so you need to keep crafting tonics to get new Fieldwork, and then complete Fieldwork to get more stuff for tonics.

Earning Upgrades

Knocking out four Minor Fieldwork quests gets you access to a Major Fieldwork mission, which has you going out to quickly test one of Eido's concoctions. These are super-quick activities but they earn you upgrades for the overall tonic-crafting system, like earning more currency or a chance for a tonic to come out at a higher tier when you craft it.

Getting the upgrades sooner rather than later is recommended, since these will eventually make the whole system work more efficiently and get you bonuses along the way. Upgrades, tonic recipes, and Fieldwork quests and mission are split up by Act, so you have a handful of each to unlock during the wait for Act 2 in November, when more of all three will become available.

Dump Spare Tonics

If you're leaning into the tonic system to unlock the new stuff, you'll quickly discover that you have a ton of extra tonics you probably don't need. It's a good idea to use them pretty much constantly during Revenant--many or even most of them work in multiple activities, not just in Onslaught: Salvation--but you'll still probably have many extras.

Keep an eye on Eido's vendor screen. At the bottom-left corner, next to her list of available bounties, you'll also sometimes see potions. Eido isn't selling these, she's asking you for them, and you have spares, you can give them to her. Your reward is a piece of Legendary gear and a few points of Vendor Reputation, so if you're sitting on a ton of potions, this is a good way to get something out of them.

Check out our guide on everything you need to know about Onslaught: Salvation and the complete list of everything you can get from Revenant's battle pass.