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Let's look at the picture, discuss it, and share our thoughts. According to the rules of Life (Captain Black-Knight), which Bayazet posted on the forum, you can't gather a pile of sulfur without defeating the orcs, but, as we can see from the screenshot, it's impossible to attack the orcs without gathering the sulfur first (it's not useful on its own, but the orcs are also guarding the gnomes) - it's located on the only tile that allows you to approach them.