"ONLY THE QUEEN MATTERS: Unless the attack roll is doubles, Swarm takes no more than 1 damage from attacks."

To be successful, does the attack on Swarm have to be doubles only, or must it be doubles and hit Swarms defence?

For example, my opponents attack value is 10, and Swarm's defence value is 16. Must my opponent roll at least two three's to equal 16? OR, would two two's (that would equal 14 and normally miss) still allow my opponent to deal their full damage to Swarm?

Nowhere does it say it's an automatic hit, so yes, they need t o hit normally

It must still be a hit. Nothing states that doubles is an automatic hit.

Planning on teaming up Swarm with shifting focus Dr. Strange.

The 2 weak points of Swarm can be solved

1. Attack and damage boost.
MYSTICAL GUIDANCE: Dr. Strange can use Empower and Enhancement. UNIQUE MODIFIER - When he uses either, also modify the attacker's attack value by +1.

2. Low defense
STAY BEHIND MY MYSTICAL SHIELD: Dr. Strange can use Defend. If an adjacent character takes damage from an attack, after actions resolve you may heal that character of 1 damage. If you do, roll a d6 and on a result of 1-3, deal 1 unavoidable damage to Dr. Strange.

With the right shifting of Dr Strange you can have Swarm with a consistent 11 attack, 4 damage, 18 defense and 50:50 chance of not even taking a click of damage

And Dr Strange can be carried by Swarm and even buff the Bee Swarms.

I thought so, but why not check anyways. Thank you everyone!!!