Once you are down to upgrading your weapons and armor ten Hacksilver is one currency that you need in abundance. You would be surprised no matter how much you have it will still keep running out very easily.
Here are some easy ways how you can gather more Hacksilver easily and fast.
Final trials in musphelheim, the final six give about 200.000 each.
Depending on the difficulty. Balance gives 200k, No Mercy gives 240k, and the lower ones give less
If you feed the Wishing Well you will get more Hacksilver. If you don’t know what the Wishing Well is then this video will help you out,
You can also try selling several items that you are sure not to use.
Some people have been able to farm a lot of hacksilver simply doing the trials in musphelheim
You can beat the Last Remnants of Asgard if you have not done so already. They’ll become available after completing the story and will be marked on the map without having to explore or discover them. They’ll give you plenty of Hacksilver and not that challenging.
Smash everything, side quests and explore everywhere. Haven’t finished the game yet but have a lot already upgraded and still have about 500k+ oh and also sell what you don’t need
Some other notable ideas are here,