Helminth isn't needed unless you don't have a weapon strong enough to do this.

To afk farm the index:
1. Go to your dojo (guarantees the correct map)
2. Start the index in solo mode
3. Turn around and face your point-banking-thingy
4. Press 1
5. Press 1 when duality runs out
6. ???
7. Profit

Remember:

• Let the spectres bank for you
• Use zenurik to sustain energy
• Don't look back!

This works because you make the enemy spawn near the energy pad, letting your clone pop them instantly. If DE fixes this we might have to actually play the Index.

[Wukong] can do this as well (even lazier), but [Duality] does more damage.