...get perfected Lionheart Partisan

1,5b and free unique pot seems worth it to be honest, I guess you can raise money again in decent time and the (temporary) advantage is relevant, not to mention terminus polearm has some absurde base atk, and whatever way you can get one it will probably be awesomely expensive - especially if it actually is a joker item, which is the option you might want the most for it.
Do you have at least 5 other empress set pieces? If you do, go for it definitely. Remember you can always resell it when drk revamp rolls around or whenever, really.

No I don't because at the moment I cannot afford warrior gear because all the pieces cost 200mil+++ CLEAN, nevermind what it would cost to scroll them (chaoses, innos, potential).

I might be able to get 5-7b when I sell some stuff but that's pretty much as high as my budget can go. Fafnirs and Tyrants are pretty much only for the "premium/rich/nxhoe" elite of MS and I probably couldn't even buy one of those items clean.