Here is an excel spreadsheet that is fully filterable and sortable. You can organize by monster number (from the Monstagram), monster name, rarity, elemental types, books, and stats (power, life, and speed). I've also added the trait or immunity each monster has. For the legendaries only, I have included each of their highest powered attacks (single and AoE). Lastly, there are columns for random effects, denial skills: stun, freeze, possession, other (like megastun, time stop, corrupted, etc.); and stamina drain skills. There is also now a damage calculator on the second sheet of the spreadsheet (look at the bottom of the window).
HOW TO READ THE STATS:
The highest powered attacks for legendaries should help you decide where to focus your strength runes. Not only does the chart show you the damage the strongest attack does, but it also tells you what kind of elemental damage it is. Some monsters have ties, so you'll see both Special and the elemental damage listed. On all skills, I only pulled from skill groups 2 and 3, since skill group 1 is pointless 99% of the time (I know there are rare exceptions, so feel free to shout out any you think might need to be included). If an effect has only 50% chance of hitting, I haven't included it. I only included stamina drain skills that sap 50% or more of an enemy's stamina (so, I haven't included Stamina Leak or an attack that drains 25% stamina, for example). The denial skills tell you whether the monster can target a single enemy, all enemies, or both with its skill. This should help you in narrowing down where to put your speed runes.
For many columns, (Type, Book, Stun/Freeze/Possess/Stamina Drain/Other), I don't recommend doing the drop down list. Instead, after you click the arrow at the top column to filter, move down to Text Filters, then select "Contains..." This will open a pop up window where you can type the word you want shown (e.g.- fire, female, AoE, etc.). It's not case sensitive. If you want to do a little more advance filtering (like filtering all water/thunder monsters), in that box that popped up, click the radio button for "And", hit the drop-down box right below it, click "contains" and type the second term you're looking for. If you want, for example, to see all monsters in Dragons and all monsters in Underworld (not just those in both), click that "Or" radio button. If you need any help navigating the filters, feel free to post on here and let me know.
HOW TO USE THE DAMAGE CALCULATOR:
Only legendaries are in this list, as you're not likely using another rarity to attack with. One of the many factors in damage calculation is your monster's level compared to the defending monster's level. As my stats are intended to help you decide which monster to choose (compared to other monsters) this formula assumes both you and the defender are level 100. The sheet already has the monster's base power and highest attack value filled it. You may not be running that skill, so feel free to plug in your own attack value in this column.
There are other damage modifiers there as well after you get the base damage. Element Damage refers to a regular attack (1), strong (1.5) or weak (0.5) attack, or some other kind of elemental weakness like sticky lava, light weakness, etc. (1.8). The options there are fixed so just select the one that applies. Attack modifiers are for things like damage boost (1.5), double damage (2), or triple damage (3). Again, the numbers there are fixed and, if normal damage, just leave 1. For runes, add up your total strength rune bonuses and convert it to a decimal (move the decimal point over two places). The formula will take care of the rest.
Don't just view it in your browser (it'll look awful and won't be interactive). Be sure to download it.
All the numbers came off the Monster-Wiki. If you see anything needing fixing, let me know! The link in this post will always have the latest version. Hope this helps somebody!