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General Tabletop Discussion
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Spell interruption rules in AD&D (and evasion/pursuit rules)
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<blockquote data-quote="ashockney" data-source="post: 6318316" data-attributes="member: 1363"><p>We relied heavily on our interpretation of the "other weapon factor determinants" paragraph at the bottom of p66 and top of p67 of the 1e DMG, and this is what we did:</p><p></p><p>We checked for surprise, if it was won by either side they got to act first (taken from initiative for creatures with multiple attack routines, p62 of the 1e DMG).</p><p></p><p>We then had everyone declare their actions for the round.</p><p></p><p>Everyone then rolled initiative, which was a d6, subtracting their Dex Modifier for Reaction adjustment ad adding their Weapon Speed Factor (minus 1 for each +1) or Casting Time in segments. If you had "multiple attacks" as a fighter or monk, you added your Weapon Speed Factor (minus 1 for each +1) again for each attack to determine what segment of initiative your attack occurred. Finally, if your action included movement, you added 1 segment for each 1/10 of your movement (walk, charge, fly speed) to arrive to your target for melee.</p><p></p><p>For example, nobody is surprised and we are 3" away. A fighter rolls a 5 on initiative (no Dex mod), and wielding a short sword +1 (WSF 3-1=2) and has a 12" move. The fighter is moving to attack a caster. Everyone rolls initiative, and the DM works up from 0, 1, 2, 3, 4, 5). On 5, the fighter begins to move to the caster and will arrive on 8 (1.2" per segment, 3" away). On 8, the fighter arrives, and now adds his WSF of 2, and will complete his attack on segment 10. On 10, I roll to hit, succeed, and do 4 points of damage, which would interrupt if his spell was casting at that time.</p><p></p><p>The caster's initiative roll on a d6 is a 3, has a +1 Dex Mod, so he begins casting on a 2, and is casting fireball with a CT of 3. On 5 (when the shortsword-wielding fighter action begins), the caster completes casting a fireball - without interruption.</p><p></p><p>If he had "attacked" anytime in the casting time (segment:2, 3, 4, or 5 (because he would win a tie)) the spell would be disrupted and lost. Also, if he had been in melee and won initiative he could have "held" his attack to disrupt the caster.</p></blockquote><p></p>
[QUOTE="ashockney, post: 6318316, member: 1363"] We relied heavily on our interpretation of the "other weapon factor determinants" paragraph at the bottom of p66 and top of p67 of the 1e DMG, and this is what we did: We checked for surprise, if it was won by either side they got to act first (taken from initiative for creatures with multiple attack routines, p62 of the 1e DMG). We then had everyone declare their actions for the round. Everyone then rolled initiative, which was a d6, subtracting their Dex Modifier for Reaction adjustment ad adding their Weapon Speed Factor (minus 1 for each +1) or Casting Time in segments. If you had "multiple attacks" as a fighter or monk, you added your Weapon Speed Factor (minus 1 for each +1) again for each attack to determine what segment of initiative your attack occurred. Finally, if your action included movement, you added 1 segment for each 1/10 of your movement (walk, charge, fly speed) to arrive to your target for melee. For example, nobody is surprised and we are 3" away. A fighter rolls a 5 on initiative (no Dex mod), and wielding a short sword +1 (WSF 3-1=2) and has a 12" move. The fighter is moving to attack a caster. Everyone rolls initiative, and the DM works up from 0, 1, 2, 3, 4, 5). On 5, the fighter begins to move to the caster and will arrive on 8 (1.2" per segment, 3" away). On 8, the fighter arrives, and now adds his WSF of 2, and will complete his attack on segment 10. On 10, I roll to hit, succeed, and do 4 points of damage, which would interrupt if his spell was casting at that time. The caster's initiative roll on a d6 is a 3, has a +1 Dex Mod, so he begins casting on a 2, and is casting fireball with a CT of 3. On 5 (when the shortsword-wielding fighter action begins), the caster completes casting a fireball - without interruption. If he had "attacked" anytime in the casting time (segment:2, 3, 4, or 5 (because he would win a tie)) the spell would be disrupted and lost. Also, if he had been in melee and won initiative he could have "held" his attack to disrupt the caster. [/QUOTE]
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