My brother and I sat down for some Magicka PVP 1v1, and was great and all until he discovered rock armor, and that it can be combined with resistances.
Seeing that I could no longer kill him, I cast my own rock armor with resistances. We proceeded to pretty much have a stalemate for the rest of the match.
Given that Magicka is a game that focuses on weaknesses and strengths, what is the rock armor's weakness, and how can I counter it? Unfortunately the self-cast armor wiki page does not have a lot of information on this topic other than slows the caster down. However, the speed reduction is marginal and not a huge contributing factor when it comes to combat.
For a specific example, say my rival uses this self-cast:
How could I take him out as quickly as possible?