Wondering how to go about making a spell similar to Gicel from Dragons Dogma.

I'm not sure how this is done I'm new to unity. In dragons dogma the spell l sends out spirals out ice from the caster in a semi random way, the ice spirals stay for a few seconds after the spell is finished. I would like to know how to make that so i could apply it to other effects. If you know of a link may i you please post it.