Example: the dwellers are facing a swarm of 10 bandits when the Galdr drops a Beckon Ygdrisll alka on them. Does each member of the swarm proc a separate aura and they all hit each other and die a horrible, verdant death? Or does the swarm as an entity proc a single aura? Bob Ross the Berserker (see other post) has a ton of multi tags he can use (because almost all his runes are mental). How does that affect the swarm? Does he hit the swarm three times or once? How does degeneration affect a swarm? What level is a swarm? It says that "When you play a rune for an action or power, you must assign actions to one member of the swarm...Swarm members must remain adjacent to one another when possible." RAW that means that swarms can't really move. Does a swarm resist its own beneficial conditions, and do they apply to the entire swarm? Can a swarm be possessed? How would that work?
Here is what I am thinking of using in my saga:
Base Level modifier: +1/Rank
A swarm is a group of creatures that work together with some degree of coordination. The swarm template is applied to a base creature and all members of the swarm are considered copies of that creature for mechanical purposes. Swarms do not necessarily have a number of members equal to the ranks in swarm (though that is a reasonable default assumption). Ranks of swarm may represent several abstract quantities including, but not limited to, number of members, unit cohesion, and training. Four viking warriors trained to fight in a shield wall may have 8 ranks of swarm, while a chaotic mob of 10 peasants might only have 3. Swarms gain the following qualities:
- All for one, one for all - A swarm lives, dies, and moves as a swarm. Individual members cannot leave and rejoin.
Condition Resistance - A swarm cannot gain intensity in any condition, though they may be affected by conditions like aura and taunt. When a swarm would take a condition, it instead suffers damage equal to the condition intensity it would have taken.
Enhanced Wyrd - When a swarm wyrds, it draws a number of runes equal to its destiny+Ranks in swarm
Damage - A swarm does not take damage as normal. Instead, If a swarm takes damage equal to its Essance+Ranks in a single combat round then it looses a rank of swarm. When it loses its last rank of swarm it is no longer a swarm. A swarm cannot lose more than one rank from a single hit unless otherwise noted
Unit Move - A swarm moves as a unit, but may spend no more than one rune on movement in a round
Size - A swarm occupies a number of hexes equal to its Ranks, but its size for the purpose of unarmed damage, speed, etc remains that of the base creature
Knockback resistance - When a swarm would take knockback it takes an equal amount of damage instead
Area Effects - Damage that affects all creatures in an area (such as from attacks with an [area] tag or aura damage) deal triple damage and can explicitly cause the loss of more than one Rank
Multiple Hits - Damage that affects more than one creature, but not all creatures (such as from the [multi] tag) deal double damage and can explicitly cause up to three Ranks to be lost
Damage Types - Spiritual damage is treated as physical (swarms do not suffer drain). Mental and social attacks are considered weak
Healing - Any time a swarm receives healing, the counter on the damage it needs to take before losing a Rank is reset. Lost Ranks are never regained, unless the Norn decrees that reinforcements have arrived (this should be a pre-planned thing, not the result of some healing power)
Sacrifice - If the swarm has some ability that requires a sacrifice, a minor sacrifice is a point of damage, a moderate sacrifice is a Rank of swarm, a major sacrifice is two Ranks of swarm, and ultimate sacrifices can't be made
Death/Drain - For the purposes of powers that ask for the number of runes in Death or Drain, that is equal to the number of ranks lost.
Misc - Swarms cannot make social attacks and cannot use skills other than perception