Stirges are one of those creatures that can either be incredibly easy to deal with, or be a near TPK. It simply depends on luck (initiative order can make a huge difference) and the party makeup.
I've played that through that encounter a couple of times, on one it was a cakewalk because of my specific build, the other time it was a near TPK.
The "perfect" build for that encounter was Human (variant) Fighter 1/Warlock 3. My character had Heavy Armor Mastery and a precast Armor of Agathys up, and had cast Blade Ward before walking into the room and triggering the encounter (because he was expecting to swarmed by the skeletons on the floor.)
Every Stirge that hit him took 10 points of cold damage (Armor of Agathsys) and died after doing 0-2 points of damage (DR 3 and remaining damage halved due to Blade Ward).
My character the second time I played through that scenario was a monk. No DR, no Blade ward, and no Armor of Agathys. I couldn't kill them faster than they swarmed me.
I've played that through that encounter a couple of times, on one it was a cakewalk because of my specific build, the other time it was a near TPK.
The "perfect" build for that encounter was Human (variant) Fighter 1/Warlock 3. My character had Heavy Armor Mastery and a precast Armor of Agathys up, and had cast Blade Ward before walking into the room and triggering the encounter (because he was expecting to swarmed by the skeletons on the floor.)
Every Stirge that hit him took 10 points of cold damage (Armor of Agathsys) and died after doing 0-2 points of damage (DR 3 and remaining damage halved due to Blade Ward).
My character the second time I played through that scenario was a monk. No DR, no Blade ward, and no Armor of Agathys. I couldn't kill them faster than they swarmed me.
