What makes a custom enemy into an EB or AV?
No.
AVs will always downgrade to EBs when you are soloing, unless you are on the highest difficulty level, and standard bosses cannot spawn as more than a boss.
If you want a custom enemy to be an EB or AV, just choose that option when making the character. You can't stop them from being downgraded based on team makeup and player settings.
Here is what the difficulty settings (known as "Notoriety") do in detail.
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Dec out.
Another question along this vein...
Is it possible to have your boss spawn as a normal, regular boss for small groups/low difficulties, and as an EB with a larger group/higher difficulty?
I really don't want my boss to die when a big group, or someone accustomed to playing on max difficulty, barely breathes hard on him... but I also don't want him to easily smish a soloing, low-attack/buff-heavy Defender into paste.
I haven't had a chance to run mine with a big group or on max diff yet (so tired, bed calling), so I don't know if what I tried is how it works or if I'm overguessing everything. Brain needs an AE break. Back at it tomorrow!
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Another question along this vein...
Is it possible to have your boss spawn as a normal, regular boss for small groups/low difficulties, and as an EB with a larger group/higher difficulty?
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I think it DOES do that (according to spawn rules). I seem to recall my EB was a boss when I played it solo on Heroic. I am in no way positive about this, though.
Dec out.
What settings do you need to have to have a custom enemy spawn as an elite boss or archvillain? (Assuming a team, since AVs are downgraded to EBs for solo players. Although, is this universal? Is there a setting under which an AV will always spawn as an AV, even for a solo player?)
Are there any settings under which non-custom enemies (a regular standard-group boss) can be forced to spawn as an EB or AV?