IPA: /ˈdɛzəˌleɪtə/
KK: /ˈdɛzəˌleɪtər/
A person or thing that causes destruction or emptiness in a place or situation.
The desolater left the once vibrant town in ruins.
Desolater is formed from "de-" (meaning down or away) and "solare" (meaning to make alone or to comfort). The word describes the act of making someone feel alone or abandoned, hence to desolate.
Think of 'down' ('de-') and 'making alone' ('solare') — this helps you remember that desolater means to make someone feel abandoned or alone.