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Not exactly : ex: Torgil the elf is fighting a Vampire
Thaco works on a 20 face dice system 1 is a failior always , 20 hits a critical hit.
A vampire let's say needs a +2 weapond to hit and has armor class of 2, Torgil has a thaco 8 with bows (The computer rolls the dice) he need (8 or higher on 20) or more to hit an armor of 0 but the vampire is an armor class of 2 so he can hit the vampire with a roll of 6 or more. ---that is with a normal bow---
But the Vampire needs a +2 weapon or more to hit, Torgil pulls out a +2 arrow but still used a normal bow. His thaco is still 8 so he still needs (6 or higher on 20) the arrow is +2 so he now needs (4 or higher on 20) the arrow will hit the vampire causing dammage accordingly.
Now if Torgil fight with a shiny +2 bow, his thaco is still 8 to hit the vampire with an armor class of 2 still requires (6 or more on 20) then you add the bow's bonnus thaco (4 or more on 20 to hit). If he fires a wooden arrow that arrow will hit the vampire but ---the arrow is not magical--- so the vampire get no dammage. But if he was shooting a goblin(wich can be hit woth normal weaponds)the wooden arrow would deal a bonus dammage of 2 points beacause of the bow.
If you compine a +2 bow with a +2 arrow you get a bonnus +3 on the thaco so to hit that vampire would require (2 or more on a 20) to hit him. ---The arrow is magical and +2--- so it will hit the vampire and since it hitted the vampire the Bow can now add the extra 2 point of dammage.
The Bows that make there own ammo Tasheron +3 gives a square bonus so bow and arrows togetter --The arrows created by the bow--- would give a the chance to hit the vampire at(3 or more on 20) to hit, the arrows are counted as +3 so it would hit the vampire. but the bonnuses with Tasheron are not cummulative so the bow and arrows don't give a +6 but stay a +3.
It's complicated, I am a bit tired so I hope it makes sence
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I am the lord of Ravenloft foolish bohdi... Come my little vampire thing you will obey me!
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