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Message: <blockquote data-quote="Shadowdweller00" data-source="post: 6787459" data-attributes="member: 6778479">By the way, the Ancient Black Dragon has a GREATER offense than its base CR listing.  The correct calculations are as follows:Averaged over three rounds:Round 1 => (67 average from breath x two expected targets) + 51 damage tail attack legendary actions + (10 average damage x two expected targets from lair)Round 2 => 58 damage from multiattack + 51 damage tail attack legendary actions + (nondamaging lair effect)Round 3 => 58 damage from multiattack + 51 damage tail attack legendary actions + (10 avg damage x two expected targets from lair)= 134.3 average damage per round (or 147.6 with lair actions).  This is the equivalent of offensive CR of 20 (CR 21 with lair actions) from the damage component as per the tables in the DMG.  HOWEVER, the ancient black dragon's attack bonus is +15, which is five higher (four with lair) than expected for CR 20-level damage for a net +2 CR increase.  This ups the total offensive CR to 22 (CR 23 with lair actions).</blockquote>