Siren Magic varies based on the Song. It can enable people to breathe underwater, alter their moods, put them to sleep, strengthen or weaken them, help them navigate unfamiliar areas... It really depends.

Summons... also vary, based on the skills they possess. Some are geared towards combat, others towards healing. Most of them have at least some skills that are useful in a more investigatory context, such as illuminating dark areas and finding hidden objects. All of them are capable of functioning autonomously.

[He knows it's unrealistic on his part, but he still hopes she doesn't ask for many more details than this. This is uncomfortable enough as it is.]