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Message: <blockquote data-quote="JenniferRPG" data-source="post: 6624942" data-attributes="member: 6795724">I am reading the Moldvay Basic Dungeons & Dragons book, about to do some of my first DM'ing with it.I am going to make a "monster card" for each and every monster in my dungeon which has all the stats that are in the monster section of the book, but along with another stat to make things easy when it comes time to DM:  a Monster's THAC0.  (Much like I saw thac0 mentioned in AD&D monstrous manual.)That way I only have to take the monster's THAC0 and subtract the PC's AC from that player's initiative card, to determine if the monster hit.Here are the set of formulas I came up with to convert from the monster manual to what I type on the monster cards:Classic Dungeons & DragonsMonstrous THAC0 Calculation[TABLE="width: 500"] [TR] [TD]Number of Hit Dice[/TD] [TD]THAC0 Formula[/TD] [/TR] [TR] [TD]1 to 8[/TD] [TD]20 - Number of Hit Dice[/TD] [/TR] [TR] [TD]9 to 10[/TD] [TD]20 - Number of Hit Dice + 1[/TD] [/TR] [TR] [TD]11 to 12[/TD] [TD]20 - Number of Hit Dice + 2[/TD] [/TR] [TR] [TD]13 to 14[/TD] [TD]20 - Number of Hit Dice + 3[/TD] [/TR] [TR] [TD]15 to 16[/TD] [TD]20 - Number of Hit Dice + 4[/TD] [/TR] [TR] [TD]17[/TD] [TD]20 - 17 + 5 = 8[/TD] [/TR] [TR] [TD]18+[/TD] [TD]20 - 18 + 5 = 7[/TD] [/TR] [/TABLE]  Does this make sense what I have done?  I can think of a simpler way to do this.  I don't want to have to look at that chart every time I roll the attack die.   Just want to do a simple subtraction from thac0.</blockquote>

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