The way you wrote it, it wouldnt apply blindness to his allies either, which the ability does. Just drop the IF and target the aura to !self. Should work
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TEST; AURA: 10 DarknessSelf, all; The Darkness; FACTION (!self); Blinded
This has the same issue. The character with the effect is still blind on screen (map black, other tokens cannot be seen), but the rolls themselves are not affected by the Blindness part of the effect. It's really weird.
Probably the Visualize Aura image is getting in the way. The engine is applying correctly the effect, seems the image is the one mixing sight (I dont have Visualize Aura so I cant really test it).
But try without it, like with this syntax for Hunger of Hadar: LIGHT: 10/10 darkness; AURA: 10 point,black; AoE Darkness; IF: FACTION(notself); OBSCURED: magical darkness; IF: FACTION(notself); Blinded
I found on other posts that keeping Visualize Aura but changing it to a ring (transparent center) or reducing alpha could work too, but I cant test it.
Clean 5e campaign, only running Aura Effects.
TEST; AURA: 10 all; Darkness; FACTION (!self); Blinded
The PCs with the AURA effect is still blinded. Please see attached screenshots.
I took the base effect example from the Forge link:
Aura of Protection; AURA: 10 ally; Aura of Protection AoE; SAVE: 5
I switched around to be enemy and -5 as follows:
Aura of Protection; AURA: 10 enemy; Aura of Protection AoE; SAVE: -5
When I roll a saving throw for the character with this Aura effect, they also have the -5 penalty. Please see screenshot.
AURA: 10 enemy controls who gets a copy of the aura effect, but any mechanics that appear on the same effect line also apply to the owner unless you gate them out.
Try: Aura of Protection; AURA: 10 enemy; Aura of Protection AoE; IF: FACTION(notself); SAVE: -5
(Sorry I cant test this myself to show you and maybe work out quirks, Im not on my pc at the moment)
If the above works as intended, than your original blinded should work too, sub SAVE for the effect (theoretically)
Back in my normal campaign session, this works (almost) perfectly:
TEST; AURA: 15 DarknessSelf, !friend,point; The Darkness; Blinded
The other PCs in the party are not blinded and scan see normally on the map; enemy NPCs who enter the aura are Blinded and that works as expected; However, the PC with the Aura Effect is still blinded themselves and has all of those penalties.
Place the IF filter (and change !friend to all if you want the darkness to affect friends too, since the ability only makes the monk see in darkness)
TEST; AURA: 15 DarknessSelf, !friend,point; The Darkness; IF: FACTION(notself); Blinded
Or
TEST; AURA: 15 DarknessSelf, all,point; The Darkness; IF: FACTION(notself); Blinded
TEST; AURA: 15 enemy,point; The Darkness; IF: FACTION(!self); Blinded
Seems to work as far as effects are concerned (the PC with the Aura Effect isn't blinded when it comes to attack rolls). However, the token is blinded on the map (black/greyed out, other tokens not visible).
The others work just fine; allies are not affected; enemies are. I'm just stuck on the token of the character with the Aura not being able to see.
TEST; AURA: 15 DarknessSelf, all,point; The Darkness; IF: FACTION(notself); Blinded
This works mechanically, but still cannot see the map. Please see attached.