You need call cube yeah, also you need change cube (or whatever it is) to do the glitch partner jump (to get up to first boss)
You can kill death first, so its *only* 10000HP to beat, that still like over 40min using a basic calculation
On persona forum
(...all details can be found here...), apparently serris was able to obtain final sword (hum maybe wrong name here) from final guard and saved with little as 5:xx
Now of course it still sux and apparently wouldnt be enought, but, that mean claymore might not be the "only" way here
Now that been sayd, i think its still worthy to make a holy claymore run, and im quite enought selfish to try making a run myself and fast, i actually would be proud to get obsolete by kmlz :p
(Witch will surely happen considering my tasing level)
Yesterday night i reached first boss, alltought, for some reasons its here i realized i could use backdash to boost a little my movements, so im kinda needing to restart