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<blockquote data-quote="lichmaster" data-source="post: 8999718" data-attributes="member: 6683330">In LU you can increase/decrease a monster's HP by 10% without altering its CR. Beyond that, you should reduce or raise its AC by 1, or its damage per round by 5%, for every 5% of hit points you varied from the base hit points.Your case would be the opposite: since you already increased its DPR by X%, you need to figure out by how much % you should decrease its HP if you wish to keep the CR fixed. Otherwise you increase CR it by 1 (+5 dmg, +15 HP), and see if the difference in HP is small enough that no mod to damage is necessary.You could do this in different ways. One way could be to conceptually split this encounter in two, one easy and the other hard. The easy encounter will probably last less than 3 rounds, while the other more likely 3 or more, so the &quot;sum&quot; should be slightly more than 5 rounds.That said, my favorite way of controlling the length of a fight is by doing it directly, by either having more monsters arriving/some of them healing if needed, or having them scatter/die quicker if I want to cut it short. Or you could add complications on either or both sides (environmental hazards, another threat joining the fray, etc)</blockquote>

[QUOTE="lichmaster, post: 8999718, member: 6683330"] In LU you can increase/decrease a monster's HP by 10% without altering its CR. Beyond that, you should reduce or raise its AC by 1, or its damage per round by 5%, for every 5% of hit points you varied from the base hit points. Your case would be the opposite: since you already increased its DPR by X%, you need to figure out by how much % you should decrease its HP if you wish to keep the CR fixed. Otherwise you increase CR it by 1 (+5 dmg, +15 HP), and see if the difference in HP is small enough that no mod to damage is necessary. You could do this in different ways. One way could be to conceptually split this encounter in two, one easy and the other hard. The easy encounter will probably last less than 3 rounds, while the other more likely 3 or more, so the "sum" should be slightly more than 5 rounds. That said, my favorite way of controlling the length of a fight is by doing it directly, by either having more monsters arriving/some of them healing if needed, or having them scatter/die quicker if I want to cut it short. Or you could add complications on either or both sides (environmental hazards, another threat joining the fray, etc) [/QUOTE]

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