Herb (Concept Teaser) is an article in Resident Evil Recollections. It was uploaded on 18 February 2015.
One of the easter eggs in the Resident Evil Revelations 2 concept teaser trailer is the herb.
> Resident Evil Revelations 2 Concept Teaser
The herbs of Resident Evil are almost as famous as the games themselves, and are an essential item, especially at higher difficulties.
On the topic of herbs, in there series it turns out that a handful of characters don't actually know how to mix them. Take Billy in Resident Evil 0 for instance, who needs to rely on Rebecca's superior mixing skills.
Admittedly it took me a while before I realized that he just wasn't able, I thought I was doing something wrong...