Getting my Spell Immune unit to benefit from Runes

[BiweeklyAaron]

Hey all,

I have a hero that essentially has Avatar activated on him permanently, and thus spell immune, but I haven't been able to get him to benefit from specifically Rune of Speed or Rune of Spirit Link.

I did a little poking around for info here and tried modifying the Rune of Speed ability to be a Hero one and require level 6 to spoof an ultimate, and assigned it to the Rune item, but that didn't seem to work for me.

Does anyone know if it's possible to get this to work? I noticed Disease Cloud still affects him, so maybe it's possible to change it to a "physical" spell somehow?

Thanks,