Heart of foreign god

There will be 10 in the Halloween event shop (not the rerun).

Edit: Also as a tip of how we are get this info is by going on the wiki for FGO (which also usually has info about JP version included) and looking at events. Our events are two years behind so for the 2018 events you just need to look at the 2016 events. They pretty much always keep to this schedule +- a week or so.

The Halloween event for this year(not the rerun) has a few in the event shop.

If you only need 2 then why not just try the 30 AP caster node this week? There are times when there's a daemon on the 2nd wave