hrvoje, the vial of blood looks like a Large healing potion, organize all your character inventories by type and then take a look, it's probably there.
Now, Leandra's Spell i don't remember if her scroll looks like a common scroll, so you can take a look.
A tip for future playthroughs: Open the backpack you start with and put quest items there. only take them out and put them into the inventory when you will use them, this way you will always know where are the quest items.
