The fourth item is a luck-based item; its effects can vary from having no impact to significantly fueling the fire. It's function isn't explained, and it exists simply because I intended to include four items, which in hindsight, was a misstep.
Regarding the theme: The concept was to nurture a very small flame into a roaring fire, with failure resulting if you don't. However, the possibility of just sustaining enough growth introduces ambiguity, giving you a valid perspective on it. I'm sorry!
Thank you so much for playing and leaving a comment! I'm glad you liked the atmosphere.