No matter how hard he tries, he cannot build anything. He's an amnesiac. He remembers nothing about the island (The isle of awakening), nor his past life as the lord of Destruction. Malroth demonstrates a lack of knowledge on many concepts, with an almost childlike ignorance at times. During his adventure with his friend, three concepts in particular catch his interest: "dreams", "love", and "conviction" (description by @chefcharbonneau!)