There are, yes! I'll quote the English hints:
- Upgrading your Workshop will decrease the number of gems and ores needed to enchant equipment.
- Upgrading your Alchemy Garden will decrease the number of ingredients needed to brew potions.
- Upgrading your Necromancy Ring will boost your Creature's melee or magic resistance depending on who you choose to serve you.
- Upgrading your Skill Trainer Arena will allow you to train beyond your current skill caps.
