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To trigger the action, the player has to either tap or click on the Valkyrie (once or a few times depending on the indicator), or drag her to a specific part of the room like near a bookcase or onto something she can sit on. These indicate actions that the player can do with her to potentially increase her happiness meter and/or receive a reward. In the dorms, a Valkyrie will occasionally have a blue speech bubble appear over her head with a chair, book, a scared or sad face, and other things.If it's white, she will say something but instead of dialogue, an interface appears where you can see her current Affection Point level and also perform some other actions such as swapping Valkyries or entering Portrait Mode. If it's a purplish tone, she will do the same, but it's to scold you for playing too long and/or tell you to shut down and get some sleep. If it's blue, she will say one of an assortment of canned statements with a speech bubble providing the translation. Your Valkyrie that is on the homescreen will have a thought bubble floating by her head that takes three colors and does different things when tapped/clicked.
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Diablo II: NPCs with a glowing speech bubble containing an exclamation point overhead will either give you a quest or an important piece of quest-related dialogue.
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