[quote=@Nanashi Ninanai]
A master for Berserker should just pull a Kirei in Fate route and power the Servant up with the suffering of children.

Isn't the Hassan-only Final Destination ruleset something inherent to specifically Fuyuki's Grail War (and Strange Fake's since it's directly based on it)? I forgot the details on that.
[/quote]

If I had a berserker I'd just use the classic "mini army of homunculi that are connected to the summoning ritual and the servant takes prana from them instead of me" schtick. Assuming it was something like Lancy, Heracles, Lu Bu, or another huge mana consumption servant. 

It might be, but there are ways around it that dont involve finding the strongest wraith and binding him to a gate in a fake summoning.