St. Trina is part of Miquella, and she can be found in the Elden Ring Shadow of the Erdtree DLC. When you first interact with her, you are given the option to either imbibe Nectar or leave. Before you decide, here's a full explanation of what happens when you drink nectar in Shadow of the Erdtree. So let's look at the choice you should make – drink nectar or not in Elden Ring Shadow of the Erdtree.
Soak up nectar? What to do next & Missable Quest | Shadow of Erdtree (The Ring of Fire DLC)
Yes, you must Imbibe Nectar if you want to proceed with St. Trina's quest in the Ring of Fire DLC.
When you first imbibe, you will fall into a deep sleep and die. When you respawn at the nearby Site of Grace, simply drink the nectar again. Do this the first four times to get St. Trina to share her first dialogue. Keep doing it and St. Trina will start talking to you in snippets. You will need to imbibe nectar six times to complete the quest.
To complete the St. Trina's quest you need to go ahead with the Thiollier quest as they are tied to each other. If you decide to leave without imbibing nectar, you can return at any time to continue the quest.
