Please only go to the Graveyard after you get the magic key, or else the mobs will be a lot stronger than you, here's from Stroganoff's walkthrough:
Enemy strategies
- Ghost - Use Fira.
- Spellbone Specter - Use Sorostab/Earth Attack and Firaga.
- Abyss Spikefly - Use Earth Attack and Firaga.
The enemies in this area can curse you, causing more damage than poison. Buy 2 Holy Charms and equip them to prevent curse. Some of the enemies can also poison you but just use Cure Potions or equip/unequip the Poison Charm after battle to clear this status.
I'll forward your suggestion about enemies dead time to the team to improve, thank you Jakez