Had mercy is a phrase that is often used to express forgiveness or compassion towards someone. However, there are a variety of synonyms that can be used to convey similar meanings. Some examples include: showed compassion, extended grace, exhibited empathy, demonstrated kindness, bestowed clemency, extended leniency, offered forgiveness, extended sympathy, and showed benevolence. Using these synonyms not only helps to add variety to your writing, but also allows you to express the same sentiment in different ways. These synonyms can be helpful when trying to describe a character's actions or emotions, and can help to create a more engaging and interesting narrative.