1) Crystals
Currently, there is only one crystal that really helps each knight, which is the crystal they can feed to their battle sprite. Everything else just clogs up your inventory, because you can't sell it to NPC's or trade it away. Moonstone and Valestone are totally useless.
First of all, you should be able to sell and trade excess minerals. But Moonstone and Valestone could be used to upgrade equipment. I was thinking of a gem system like other MMO's have, where you can upgrade items by putting gems in them. Moonstone could be a speed gem, for example, and Valestone an attack gem. With this system, they would have a purpose, and new crystals could be added to the game.
2) Hall of Heroes
This isn't as much a suggestion as a complaint, but I'd like to see this.
I don't think there's a single non-paying person on the game who hasn't had trouble with this at some point. Hall of Heroes takes *ages* to complete because after the two or three items you can upgrade with the orbs that you get, you need to get orbs with energy. (note that you can use crowns at the auction house, but it costs more). The current rate is around 10000 crowns for 100 energy, and you can't get enough orbs with that. Personally, I've been stuck on 4* Hall of Heroes for around three months. The amount of money you need is just ridiculous, and while you can get alchemy orbs as drops, they're super rare. I think either Alchemy Orbs should cost less or you should get them more often as drops.
3) Energy and Inflation
Sure, I'm still not a 4* knight. But I've been on this game for quite a while, and the cost of energy nowadays shocks me. I remember when it used to be 5000cr for 100 energy. Since then, the price has skyrocketed-- it's doubled to 10k+. There should be safeguards against inflation: i.e. NPC energy sellers that sell for a fixed price, or system offers whenever the cost gets to high, or changing the energy cost of items in the depot so they cost approximately the same amount of crowns (i.e. pikachu hat (totally made up item) costs 500 energy, and 100 energy = 5000 crowns on average. Later, average price of energy goes up to 6000 crowns, and pikachu hat now costs 417 energy.)
The algorithm I used for that example is extremely simple. Take base cost of energy, convert to crowns, divide by current average cost of anergy, sell. And yet this would effectively counter inflation.
Please tell me if you think there should be any changes to these ideas.
1 - We have a thing called Unique Variants. We dont need weapons getting more powerful. But we still haven't decided a use for Moonstone and Valestone. If you want to deal with your useless minerals, then you can make Sprite food and trade them or something.
2 - I'm not sure how to help you with that. Check the Orb rates on the wiki for a good orb farming mission.
3 - I'm not an economical pro, but that just sounds bad.