With the inclusion of Shiva to the game, the Primals now complete the elemental wheel reminiscent of past final fantasy games.
The following suggestion will look at a way to incorporate that wheel as a tactical aspect to Primal fights in the future - assuming that there will be a Savage mode Primal encounter added at some point down the line. This suggestion isn't a hot-fix and would require time to balance with current/upcoming gear.
(At present Extreme encounters are challenging enough, hence why this is titled a Post-3.0 suggestion).


Ok, this is going to be a long read, so first off some reference.

The Elemental Wheel:
Earth > Lightning > Water > Fire > Ice > Wind > Earth