Valmiki Ramayana Yuddha Kanda Sarga 17 Shloka 4

स च And that Vibheeshana, मेघाचलप्रख्यो resembling a mass of cloud, वज्रायुधसमप्रभः the equal of the God who wields the thunderbolt, वीरो valiant man, वरायुधधरो wearing excellent weapons, दिव्याभरणभूषितः and adorned with wonderful jewels.

Vibheeshana looked like a mass of cloud, like someone who can cause thunderbolt, possessing excellent weapons and wonderful jewels.