In Dynasty Warriors 9 Empires, brute force isn't going to get you extremely far in the game, especially on the greater difficulties, which can be rather brutal. Instead, you'll have to employ a fair bit of strategy, and part of that is efficient utilization of the Secret Plans you have access to.
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Secret Plans come in two flavors, and both are unhelpfully given the same exact name. The first flavor is Personal Secret Plans, up to four special abilities that you can use by defeating enemies to charge them up, like Musou Attacks. The second flavor is Grand Secret Plans, which are stratagems that can affect entire battlefields at a time to give you an edge. Both you and your enemies will have a Grand Secret Plan.
In simplest terms, you can think of Personal Secret Plans as equippable special abilities. They come in four different rarities and are acquired by completing battles, unlocking certain Titles, or as gifts from officers that like you.
Personal Secret Plans have a wide range of effects that you may trigger at will, so long as they are charged up through defeating enemies. These are:
The main focus of Attack Plans is to deal a lot of damage in a very short amount of time. Most of these attacks are elemental and have their own properties listed in the next section.
Single Unit Upgrades improve the user's stats, usually their attack power or speed, for a short period of time. Area Upgrades will do this for all nearby allies. In a similar vein, Restore Plans will fill your health bar or, rarely, your Musou Gauge.
Special Plans are unique in their effects, and there are fewer of them as a result. Their effects range from nullifying the Army Affinity
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