The Lotus is one of the many Greeneries you can obtain in Hades 2. It is said to invoke a sense of inner peace, which is quite nice, though it is perhaps best used to cast spells that involve serenity and sharpness.
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However, in Hades 2, getting this green is no easy task. You will have to defeat a tough boss, Hecate, if you want to get it.
You can harvest Lotus in the Oceanus of Hades 2. This is the area you enter after defeating Hecate. Defeating Hecate is a challenge, especially if you are new to roguelites, so don't be discouraged if it takes you a few tries to defeat her.
Once you do that, you’ll enter a room with a mysterious guy who won’t reveal his name, and then you’ll enter Oceanus. As you progress through the floors, you’ll find a Lotus in some levels that you can collect. The amount you get in one run varies. But for the few runs I’ve done, I’ve collected between one and three Lotus Flowers, which is good enough to unlock enchantments. If you need more, you can always return to Oceanus and collect more.