How to Complete The Sun Seal
The objective is to examine the Stone with No Name. There are some enemies: a Ghost, a Wraith, a Baknamy, and a Lilith. The Ghost and Wraith will turn into graves if their HP reaches 0, but the graves will turn back into the enemies after a few turns. You can get rid of the graves permanently by using moves like Burial or Exorcise on them.
After you touch the stone, there will be a battle where the objective is to defeat all foes. The foes are a Baknamy, some Headless, some Thunder Drakes, and a Zaghnal.