Léizhīxīn shì zhè bù xiānxiá xiǎoshuō lǐ de fǎbǎo míng.
Heart of Thunder is the name of a magical artifact in this xianxia novel.
Tips
culture
Pattern '[noun] 之心' = 'heart/core of [noun],' a fixed literary template (赤子之心 a child's pure heart, 仁者之心 a benevolent heart). 雷之心 reads as a name in xianxia/fantasy fiction or game items rather than everyday speech.
