S8·E23 Between the Earth and The Sea

At Alfea, Tecna and Aisha must pass an exam assigned by Professor Palladium within a time limit, but the two do not agree on how to act and end up failing. At the end of the lesson, while the two quarrel, at six fairies the Star Case appears, guiding them to Coralia, where the sixth primary star is located. Since Aisha thinks she is in the sea and Tecna is in the mouth of the volcano, the two fairies have another spat and so the girls decide to separate: while Aisha, Musa and Flora head towards the sea, Tecna, Stella and Bloom they go to the volcano, where they encounter large lava golems that protect the core.