4th rule, Swarm (05/23/2008 Monster Manual抜粋)
・Swarmはmelee attackやranged attackからは半分のダメージしか受けない。
Swarm:
A swarm is considered a single monster even though it is composed of several Tiny creatures.
Most single swarms are Medium, but some can be larger.
A swarm takes half damage from melee and ranged attacks. It is vulnerable to close and area attacks, as indicated in the monster's stat block.
A swarm is immune to forced movement (pull, push, and slide) effects from melee and ranged attacks.
Close or area attacks that impose forced movement affect the swarm normally.
A swarm can enter or move through an enemy's space; this movement does not provoke opportunity attacks.
An enemy can enter a space occupied by a swarm, but the space occupied by the swarm is considered difficult terrain, and doing so provokes an opportunity attack.
A swarm can squeeze through any opening large enough to accommodate even one of its constituent creatures.
For example, a swarm of bats can squeeze through any opening large enough for one of the bats to squeeze through.
See the Player's Handbook for squeezing rules.
・close attackやarea attackにはvulnerable(弱点扱い)。
・melee attackやranged attackによるforced movement(強制移動, pull, push, and slide)にはimmune(完全耐性)。
・Swarmは敵のいるスクエアに入ったり通り抜けたりできる。この移動によるAoOは発生しない。
・Swarmのいるスクエアには進入可能だがDifficult Terrain扱い。AoOが発生する。
・Swarmは構成しているクリーチャーが通れる場所なら、その開口部からSqueezeして通り抜けることができる。
・SqueezeのルールはPHB参照。
相変わらずのSwarm Creatureの紹介。
DungeonやSewerはSwarm RatやSwarm Verminというお約束を守るべく、ルール面も完璧ですよとアピールしているようだ。
例として上がっているStirge Swarmは想像しやすいだけに嫌な相手。蚊柱？
HR+15,2d6+4 and on going 5 damage(save ends)という攻撃がどの程度厄介なのかよく分からんが。
そのうち追加で集合知性鼠（超能力）も登場するのであろうか。
