The word "wreakful" means causing or inflicting harm or damage. Some synonyms for "more wreakful" could be "more destructive," "more dangerous," "more harmful," "more catastrophic," or "more devastating." These words all convey the idea of something that causes significant damage or harm. Other possible synonyms could include "more calamitous," "more ruinous," "more disastrous," or "more deleterious." It is important to choose the right word to accurately convey the level of harm or damage being caused, as it can greatly affect the meaning of a statement or sentence.