Hello, i tried this, 

if UnitBuffName("arena1", Shadow dance) 
then
      RunMacroText("/Cast [@arena1]Psychic horror") 
end
 

 

But it doesnt work, if someone could help me with that it would be great.

Thanks in advance

If UnitBuff(“arena1”, “shadow dance”)

then CastSpellByName(“Psychic Horrow”, “arena1”) end

Should work, idk ?, not home to test 

First of all
UnitBuffName is something I added to my api. It's not native to the wow lua api.
It's funny how stuff from my api keeps showing up on these forums, not sure where people are getting it from.

Depending on what expansion you are on you shoudl use either UnitAura("Unit", "SpellName") or UnitBuff("Unit", index) or UnitDebuff("Unit", index)