Depends on what you mean by passive. Like an aura that affects all nearby enemies or a random enemy every N seconds? The unit with the ability acts as if parasite was cast on it all the time?
The aura wouldn't be too hard. Just make a dummy aura that affects enemies, and when a unti dies, check if it has the buff the aura gives, and if so, make a watery minion thing. If you want it to act just like a summoned unit, you could make a dummy caster with a regular summon ability (like summon bear). For random enemies nearby, every N seconds pick a random enemy nearby that doesn't have the Parasite buff, make a dummy caster, and have it cast parasite on that unit.
If you want the unit to just spawn a minion on death, go ahead and do that with a trigger.
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory
I will be AFK for a couple of days you guys hold down the fort while I am gone. I will be checking in on my phone but that will severly limit me. Be back saturday!
I just got to watch the video because even though I was there I was trying to work out tech problems with the chat since I was the social media guy so I was distracted but check it out guys the video is super fucking great!