How to make a mob inflict effects when they deal damage?

[dusk maple]

So I'm trying to make a Creeper variant where they don't deal any damage BUT instead they deal blindness for 30 seconds. How would I do that in mcstacker.net?

[frail ferry]

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[atomic rover]

You could try setting the ExplosionRadius of the creeper to 0 and also giving the creeper the blindness status effect.
If that doesn't work, however, than you'll need to use more than just the McStacker and will need to do some actual datapacking.

[frail ferry]

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