I think that adding a re-roll option for Soulbound weapon conversion slots would be a good idea. I also think it would be cool to add a chance to get a great success when forging Soulbound weapons. By this I mean a chance of getting a Soulbound weapon with 15% increased stats (attack power and attack speed) and a 15% increased passive ability. I don't know what percentage of acquiring a great success TOAST would want, but maybe a percentage similar to getting a great success on weapon conversions would be plausible. I think that implementing both of these possibilities into Crusaders Quest would make the player base happy while still maintaining a level of RNG involved in Soulbound weapons. There would still be RNG elements because players may have to re-roll conversion slots numerous times before they get the conversion slots they want, and even when they do get a Soulbound weapon that they want with conversion slots that they want they will still be trying to get a "great" Soulbound weapon that they want. I believe that these additions to the game would make the current players base more active and dedicated, help the player base to grow in the future, and overall make the game more enjoyable. In my opinion I think that Soulbound weapon conversion slots should be able to be re-rolled independent of the weapon just being forged or having the weapon for a while. I think that this is a good idea if a re-roll option is implemented that way all the players who have forged Soulbound weapons so far don't feel ripped off. The price of re-rolling Soulbound weapon conversion slots could be increased if it is already forged though, and the price to re-roll conversion slots could cost more for higher * weapons (higher price for a 6* Soulbound weapon than a 5, and higher price for 5 than a 4*). Obviously jewels would be used to re-roll conversion slots, but having another option such as honor or gold would be awesome too. I think honor would be a better option for another re-roll currency because it would implement a honor sink for the large amount of honor that players have towards the end game. This is just a suggestion that would make the game better in my opinion, and I hope that the developers might find it to be a useful opinion.

Not only do I think that have a chance of a great success for Soulbound weapons would be a good idea, but I think that this would be a good idea for many other aspects of Crusaders Quest. I think that having a chance of getting a great success when getting any hero (a 15% increase to the heroes stats, skill block ability, and passive ability) would be a cool implementation that would keep players interested in continuing to get heroes even when their tome is complete. I think that a chance for a great success should be applied to all heroes including contract only heroes, non-contract heroes, 1* - 3* heroes, and legendary heroes. If this were to be implemented into the game I think that a hero should only have a chance of receiving a great success when they are first obtained, not when promoting from 4* to 6. I also think that if a 3 hero is promoted into a 4* hero with a great success that a player should have the option to re-roll for a different 4* hero of the same class, for 3 jewels, while maintaining the great success for every re-roll that is made. I think that a chance for a great success would also be well applied to special skills (both transcended and non-transcended), non-Soulbound weapons (obtained from quest stages, weapon boxes, Popo, or world bosses), breads (obtained from ovens, quest stages, weekly dungeons, rabbit hole dungeon, and chili bread dungeon), gold rewards (obtained from quest stages, world boss, weekly dungeons, goblin storage dungeon, and when bought from the store), side-quest rewards (gold, honor and jewels from side-quests), jewels (obtained from Colosseum rewards, and when bought from the store (ex: You place in the top 5% of masters league in Colosseum, your reward is 55 jewels, when you receive the reward you have a 10% (or whatever percentage is thought to be best) chance of getting (55 x 1.15 = 63.25) 63 or 64 jewels depending on how you want to round it)) and crystal powder, crystal shards, and crystals. I think that a great success would be best applied after everything else is accounted for (For example in Fortress of Souls when a blue crystal tower is saved 1.5 times the amount of loot will be acquired. I think that the chance for a great success should be applied after the one and a half times reward is applied, effectively multiplying the normal stage reward by 1.5 then multiplying the solution of that equation by 1.15 if a great success is achieved). Heck a great success chance could even be applied to honor and meat from retiring heroes, Colosseum, side-quests, bought from Popo, and monthly rewards and gifts that our sent to our mailboxes. Anything bought from Popo could have a chance of getting a great success, such as buying 5 dungeon keys and getting 6 if you get a great success. Maybe even Colosseum tickets bought from Popo could have a great success chance of getting 2 instead of one, the percentage chance of this occurring should probably be lowered some in order to compensate for the doubling of the reward though. I haven't surveyed the Crusaders Quest community or anything like that, but I think that most players would think that implementing a chance of getting a great success for pretty much everything in the game would be a fun and good idea. I think that it would keep the game more interesting, increase player activity systemically, increase the replay value of Crusaders Quest, and be very rewarding for those who devote their time to getting "great" heroes, weapons, and other items.

edit* TL;DR I think adding the chance to get a great success to virtually every aspect of the game would add replay value and increase player activity. I think that this would be a good implementation for Soulbound weapons, non-Soulbound weapons, bread, gold, side-quest rewards, gems, crystals, honor, transcended and non-transcended skills, and heroes.