W.I.T.C.H., Season 2

Halinor:
When Phobos' reign on Meridian forced us to raise the Veil, we could no longer watch over her.

Yan Lin:
She must have escaped, and gone into hiding.

The Mage:
On Meridian. Perhaps a portal opened on Mount Thanos, allowing her escape.

The Oracle:
Nerissa is a greater threat now, than she was then. Every world has a source of mystic energy, like the Heart of Kandrakar. Elyon was the Heart of Meridian. With her power, Nerissa's might equals the five of yours...combined.

Irma:
Right! Cause otherwise, way too easy.

Will:
At least, she doesn't know we're on to her. If we head to Meridian now, we can still take her down.

The Mage:
Hmmm, a wise plan.