Who's sending demons to the living world?

As we saw in Helluva Boss, demons can only go to the living world, with the portal opened by the grimorie, but there is some characters that aren't with the grimorie but was in the living world Like Rolando & Sea Karen. Who's sending them there?

As we saw in Helluva Boss, demons can only go to the living world, with the portal opened by the grimorie, but there is some characters that aren't with the grimorie but was in the living world Like Rolando & Sea Karen. Who's sending them there?