here is the idea:
-Add new Boss in Grimaldaz, a strong Dragon ( http://prntscr.com/ro80ny). Drops sometimes Massilan-fibers, "Dragon-Eggs" (Substances) and dragon-bones(better than demonic). You can combine the new boss with a really short quest, at the end of the quest you get the recipe for hubelgor (10xGalandor+10xKryanbor+2x"Dragon-Egg")(metascience or alchemy). The boss dragon should be as strong as the Owl, with the new armors and weapons it shouldn't be too hard.
- At a bestiarium in Grimaldaz you can breed a new companion, a young Dragon http://prntscr.com/ro999b. To get him you need 20 Dragon-Eggs. The Young Dragon should have very high breeding-, taming- , horticulture-, woodcutting-(60-75) and archeology-skill(75-90). Also add recipe for Elicard-Planks and new archeology books for better bookcase. So we will get access to 99-runes and elicard.
-at the bestiarium you get a new task for Breeding. If you got your young dragon you can produce the dragon eggs. Each action costs you a lot of meat and fish, and produces 1x"Dragon-Egg". Sometimes you get "broken Dragon-Egg-Shell"(Substance), you can use it in combination with Hubelgor to create Dragon-Scales(metascience or alchemy) for better high-end armors. You can get the recipe after a guild festival at the palace.
- Implement a new (guild-)building, Dragon-Master-Academy, where you can add a dragon to your other companions ( cerry(90 blunt), yraen(90 slash) and rowana(90 pierce)) "replacing" them with strong dragon-masters ( needs high taming and breeding skills, a lot of meat and fish, 40 Dragon-eggs and maybe an item like the "Falconers acknowledgement") http://prntscr.com/ro8p4d. Also you can use the Academy as a guild arena where you can fight against 3 Dragons(80 blunt, 80 slash, 80 pierce like the other guild arenas) For design of the new Dragon-Masters and their dragons you could make a small one-week comunity-contest, where the players show you their design, and the best ones win
Minor changes(not very important):
- please change the poison-production-rate from 1 to 4.
- make wingus harvestable
- add recipes for wingus and massilan
Sounds like a lot of fun if you ask me
Dragons fit very well with therian-saga. Meat and Fish get a new reason to be gathered, may be good for market. Fighters get a new boss, companion and armor. Crafters get new materials. A new guild festival and building for the guild. Breeding and hunting isn't useless anymore. Old players may return and won't leave for a while. The players will be busy for a long time. Shouldn`t be too hard to implement since there are no new game mechanics and almost nothing to translate so that even with a small team you should have no problems 
