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Message: <blockquote data-quote="Cleon" data-source="post: 9127736" data-attributes="member: 57383">Next we'd better decide on the number of Hit Dice.A Challenge 5 creature typically has 131 to 145 hp, which matches a range from 131 (29d8) to 144 (32d8) as venomwings do not have a CON modifier.Is that too much? Well a Rat has 1 hp and a Rat Swarm has 24 hp. Individual venomwings have 7 hp, so if the swarm has 24 times as many hit points that'd be 168, even more than we're using.However, the swarm also has lots of resistances/immunities, including Magic Resistance, so if it had 135 (30d8) or 144 (32d8) hit points its Defensive CR is 13 or 14, which is WAY too high.If we halved the HD to 15d8 (67 hp) or 16d8 (72 hp) it comes to DCR 5, which is what we want.Of the two, I fancy Hit Points 72 (16d8).</blockquote>