Biting Swarms - not Insects

strega

Mongoose
Thinking about feral rats, piranha shoals, movie style scarab beetles and looking up the rules for insect swarms I came up with the following for those pesky rats and scarabs to terrify the players.

Flesh eating animal swarm
Size of pack Number of bites
10 1D10
25 2D10
50 5D10
75 7D10
100 10D10

Heavy clothing subtracts two bites per die from the number of bites suffered every round. Armour subtracts one bite per die, though armour combined with heavy clothing will only subtract two bites per die total. Adventurers who take precautions against a swarm by wrapping themselves in cloaks, blankets and other heavy fabrics will subtract three bites per die. Note that this must be done prior to entering a swarm – by the time the Adventurer is taking damage, it is already too late. Such muffling requires three Combat Rounds.

Magical spells such as Protection subtract one bite per die for every two points of Magnitude.

Creatures with six or more points of natural armour are immune to the effects of a swarm.

Multiply the number of bites by 1 for ordinary rats, 2 for giant rats or scarab beetles and apply the resulting total damage to the lower limbs and work up the body, abdomen, chest, arms and finally head. As soon as a location receives a Major Wound the next point of damage is taken off the next location.
 
I like the idea of rat swarms etc., but I see some potential issues.

Idea behind the insect swarm's is that insects are so small that (non-natural) armour doesn't protect much against them (they can go in from the smallest cracks) and their damage is based on poison only. However rats and such creatures are larger, so they can't really hurt a character who is wearing full plate mail (with helmet which protects the face). I don't believe that rats can do much damage against any armour (individual rat bite probably makes 1-2 points of damage and most armours stop that), they can however harm unprotected areas. In real life thick leather glove is enough to protect your hand from rat bite. Therefore rather than reducing the bites, armour should protect with it's full value. Which however makes them irrelevant threat unless party is unarmoured.
 
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