Illumination
Marivhon, you find that there is already a rose in the vase in the lantern. You just seem to have an extra. However, good thinking... the three lenses you found in the glass world fit perfectly into the grooves within the lantern.
Of course, as has been oft-discussed, you cannot move the lantern. The lantern itself is in the ruined theatre, far from the crypt with the dead girl. Now with lenses and a light source, as the shutters move, strange lights are projected onto the stage. Mostly abstract swirls or wisps, but you can occasionally make out half-formed images of other things. Unclear as to what these images are though.
You have an interesting thought, and place the chalice in the cupped hands of the statue above the girl's tomb. As if by design, the chalice fills with a thick liquid, halfway between dark arterial blood and... oil.
...
Dave FoO, Speak With Dead cannot reach this dead monk... he's been dead far too long for your spell to breach the void. On the plus side, hey, can of Fresca.