This is not a bug, it's correct. The Cnidocyst cannon is Ion with the EMP effect. Immunize your armor against EMP effects and that cannon simply becomes another Ion weapon which will cause damage to your armor.F50 wrote:A nasty (bug I think) thing about EMP immune armor is that it takes damage instead. about 25hp or so of it for cydocysts.
Non-millitary Items for civie challenge
With EMP based Ion weapons, the EMP gets prioritized but whenever you cancel EMP out via immunization, the Ion takes over. This also applies to cracking bases with an EMP weapon--the Ion takes over. I'll assume that bases are immune to EMP.