at this point, basically anything; though high emotion (positive or negative) is most likely ... and he's significantly more emotional than he prefers to let on lmao. atm he's feeling exceptionally frustrated with Everything so any light touch would do it (asking abt his family, asking about Taako, asking about the others here in the quarantine, etc).

the effects! are myriad ... there are actually several tables worth of them from various D&D editions; here's one, but there are a lot of homebrew tables too. basically it includes things like--aging/de-aging, illusions, other types of transformations, casting harmful or beneficial spells unconsciously, affecting the environment, affecting people near him, etc. so like ... he could turn either himself or someone nearby into a child for an hour or so, or both at once. things like that!