Larian Studios Forums Divinity 2 - Ego Draconis (English) Help/Tips/Tricks cant complete the quest with DK given by Iledia

I'm playing Russian version, so the names may be wrong. There is a quest in Orobas Fiords when you must find the Dragon Chalice and some plants (I dunno how it sounds in English) to resurrect or do something else with Orobas or another Dragon Knight hidden in some vault, where the man with the name of Iledia stands. I've found the Chalice and these plants too (by reading thinkings of Nicolas Thaler and so on), completed the quest with demons, water and sacrifices before resurrecting the knight as the cave was near Nicolas... Then returned to Iledia and... he doesnt want to do anything. Then I looked into my backpack and didnt see any quest plants there I dont have saved games before getting these plants, last saved game is in the cave before fighting winged demon being a dragon - no plants in the inventory there. And of course in the journal it's written as if I do have the plants
So is there any way to get these plants one more time, and is this quest essential, or just a side-quest?

Well, yeh, it's a side-quest. Either way, you CAN get another "copy" of that plant from the same guy. Just ask him to sell it to you.