From the GU #31 Preview
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Well, we have an interesting change in store for Enemy Mastery abilities (like Skeleton Master's Strike or Gnoll Master's Rage). Instead of learning many, many different abilities, each of which is good against one particular kind of target, you will instead learn one Master ability than can be used against any of the types of creatures that you have mastered! Less time spent searching for the right button; more time spent killing things and taking their stuff – that's our motto!
In addition, the way that you master different types of creatures – and gain the ability to do grievous bodily harm to them – is changing as well. Previously, you were granted the choice of one Mastery ability out of a small set when you reached certain levels. Now, however, you will instead learn to master your foes by completing the existing Lore and Legend quests that teach you about that particular enemy. When Game Update 31 launches, your existing Mastery abilities will be removed and any enemies for whom you have completed Lore and Legend quests will be added to the valid targets for your new, unified Mastery ability.
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I like this a lot. I think that this is a much more intuitive way for the Mastery Strike/Rage to work and I think that the ability will now actually get used more than it was before. I think people tended to neglect it or forget to use it due to having to switch it out for different encounters or dig through your spellbook for ones you haven't used in awhile.
Additionally, this means that in the near future we will see L&L quests implemented into the game for the newer EoF enemies that currently do not have them (bugbear, kobolds, brownies, wolves, clockworks, etc.). Good times
What do you think about this? Will you use your mastery strikes more now? Will this drive you to finish all the L&L's that you never completed before?