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Message: <blockquote data-quote="dave2008" data-source="post: 8100714" data-attributes="member: 83242">A typical AoE is like a dragon's breath weapon or a fireball or the meteor swarm spell.  However, you are going for cloud effect so I would look at the Vrock's Spores attack. Using that as a template, I would write something like this:Atropal Mass Ejection (1/500 Years).A 240-foot-radius cloud of toxic fumes extends out from Atropus. The fumes spread around corners. Each creature in that area must make a DC 26 Constitution saving throw, taking  55 (10d10) poison damage plus 55 (10d10) necrotic damage and becoming poisoned on a failed save, or half as much damage on a successful one. While poisoned in this way, a target suffers one level of exhaustion at the start of each of its turns. A target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.The range of the cloud doubles at the start of Atropus' turn and the cloud persists until Atropus dies or it stops releasing toxic fumes (no action), then it disperses in 1d10 days.  Additionally, a creature that starts is turn in the cloud must make a DC 26 Constitution saving throw or suffer the same damage and effects as the initial attack.At the start of each of Atropus' turns after the cloud has expanded for three rounds, 1d10 atropals coalesce at random locations within the cloud. The atropals act on their own initiative and remain until killed or the cloud is dispersed. They are loyal to Atropus and follow its commands.Design Notes: Range and damage are just place holders as I don't know enough about what your making.  However, I would suggest smaller numbers that keep hitting you.  So rather than wipe everyone out in the first go, this builds the terror each round as it gets more and more deadly.Also, I would be careful about making this attack to strong as it will completely wreck your CR budget. Also, simply saying "I win" is generally no fun.PS I used a DC of 26 because your attack was +18.  The DC for a +18 attack would be 26 (not sure where 37 came from).</blockquote>

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