Reuben's "Gaian" is a short, two-stanza poem about how far someone will go to protect the person they love. The speaker talks about "she" rather than "I," so we're watching her from the outside, perhaps through the eyes of someone who knows her well. The opening line is a warning: don't even ask what she'd do if her love were in danger. The answer, we're told, is simply "too much."
The second stanza spells out the threat. If her love were taken, nothing would remain except rage, and that rage is enormous: she would "tear worlds apart." The title may hint at something earth-sized or planetary, which would fit the scale of that image, though that's an inference from the word itself.
The mood is tense and quietly menacing. The lines are short and plain, and that restraint makes the threat feel more real. Love and violence sit side by side here, and the poem suggests that deep devotion can turn fierce when it's under attack.