After a few tests on some lesser monsters i think id like to add further on Chazzire's post mentioning advanced skill slot limits, i find it also feasible to be limited with intermediate skills but they can have alteast two mystery talents activated and the level of mystery talent they can learn shall be accessible through the use of gems. If a certain monster wants to learn a mystery talent from the common's talent pool they will just have to use a normal rune gem and the main difference, they can access the epic and legendary mystery talent pool using respective rune gems. This will be limited to rare levels and below.
I think certain mystery talent combinations can give varied outcomes even though they are limited to intermediate skills only. Is that a nice trade-off?

there might be a possibility that a Dodo can face-off head to head with a Flight fully equipt of advanced skill arsenal armed only with combo mystery talents and intermediate skills at S level.
Though thinking critically it will be really less complicated for developers to make changes if they indeed allow even just one advanced skill for lesser monsters with the compensation of their own stat advantages if there maybe any at the current version as compared to the mystery talent option. I find it interesting for Branchy to have photosynthesis, the skill itself for me is advanced level (though i have yet to get a book of this to verify the level) since using it gives a significant difference in PvP situations and Branchy is only rare level. i think the developers can use this as a lead of what we want to achieve.
By relevance, adding or allowing even atleast one advanced skill or mystery talent to lesser monsters will make the gameplay more dynamic, unlock diversity, break the issue that was created due to the imposed limit of advanced skills to epic/legendary monsters and might even make the alternative monster selection a lot more active at its current state.
If this is attained, i also agree that new monster introductions will not be inclined for constant releases; player's will have quite some time to be preoccupied exploring the options and possibilities of the already released and available monsters. This, in a developers perspective will give them leeway to not immediately exhaust the saturation of too much elements in the game, making its lifespan longer because updates will not focus on too much and too many information but expounding more on the games mechanics which can extend the players curiosity and limit burn out of the game.
More ideas please! Lets discuss about it!
