In this video, I discuss both the legacy and non-legacy versions of a Spark character I have been playing for several weeks and have farmed many mirrors on running T17 maps. The only map mods I can't run are Reduced Flask Charges and Less Defences as I run these T17 maps with Back to Basic.
This is an expensive build as I would suggest having an Original Sin + 1 mirror to start, but once you have things going, you should be able to make 40 divine per hour in T17 maps.
The reason I am CI for my legacy build is because legacy chests can have 1k+ ES, which carries our defenses. Also, since we run Widowhail on non legacy version and quivers can't roll ES, the quiver gives 300 life, which carries the non legacy defenses.
Non Legacy:
https://pobb.in/gAukksqNcuty
Legacy:
https://pobb.in/Bs2JcTNQAqQM
Non Legacy Spark: (Budget Friendly)
https://www.youtube.com/watch?v=9rsX1MGEUPk
Timestamps:
0:00 - Introduction
0:40 - Non-Legacy Spark
7:40 - Legacy Vaal Spark
11:23 - "Immortality" Tech