Lyric discussion by sobot 

Cover art for Medusa lyrics by Tarja Turunen

As is well-known, Medusa was a mythical monster, turning to stone anyone who looks her in the eyes. (Therefore "Last for you to see will be my eyes"). The singer presents herself as a temptress, already prepared to ruin her lover's life. "You will find my truth in the reflection": the hero Perseus managed to overcome Medusa by watching her reflection in his shield. Hence she becomes harmless when you "see through her".