For the best non-riven version: https://overframe.gg/build/382783/tenet-cycron/tenet-flare-286k-burst/

Cascadia Flare was built for this weapon. This thing can max out flare stacks in under a second with 0 kills, and maxes out at higher peak damage than any of the other arcanes.

• At 0 Kills. 40 max cascadia stacks. Averaging 19 heat procs per second per target = 2.1 seconds for full ramp up on a single target or 0.7 seconds for full cascadia ramp up with 3 targets.
• Any stacks of [Galvanized Diffusion] will speed this up even further, capping out at: 27.5 heat procs per second per target = 1.45 seconds for full ramp against a single target or 0.48 seconds against 3 targets.

Melts everything. Full stop.

(Radiation is an equal alternative for the Kuva element.)