We have not played for a couple of weeks due to real life stuff. Today it looks like we will get a long session. In the last sesison the PCs got in a fight with the local assassins guild andafre ball spell and a keg of gunpowder were detonated in one of their locations which was a nice inn. IOn the last battle of the evening they discovered that the Red Blade assassins were in league with Drow. My Drow are heavily based on 1E with superior MR and abundent Drow items (Elven cloak, boots, +2 weapons, OSR style knockout poison). All Drow equipment falls apart in the sunlight of course. They managed to defeat 4 Drow but it was painful.
My Drow
Drow Weaponmaster (gladiator reskin) CR6
Medium Humanoid (any race) any alignment Chaotic Evil
Armor Class 19 (chain shirt, buckler,)
Hit Points 112 (15d8+45)
Speed 30 ft.
Saving Throws Dex +7, Con +6, Wis +4
Str 15 (+4), Dex 18 (+2), Con 16 (+3), Int 10 (+0), Wis 12 (+1), Cha 15 (+2)
Skills Intimidation +5, Stealth +7,
Senses passive Perception 11
Languages Any one language (usually common
Challenge 6 (2300 XP)
Superior Magic Resistance: 13
Skilled. A melee weapon deals one extra dice of damage when the drow hits with it (included in the attack)
Equpment (all Drow), Boots of Elvenkind, Cloak of Elven Kind, +1 short sword, +1 chain shirt, +1 buckler, 4 dose drow poison.
Actions.
Multiattack. The weaponmaster makes 3 melee attacks or two ranged attacks.
Shortsword. Melee or ranged Weapon Attack: +8 to hit,. Hit 11 (2d6+5) piercing damage
Hand Crossbow +8 to hit, 1d6+4+paralysis (DC13 con save)
Drow traits (page 128 MM)
For this weeks special I want a 5 way staged battle betweeen the PC;s,Red Knives, Drow, the thieves guild and the local law enforcement. The Drow are not Lolthites but worship Orcus. Small bands of elite Drow and large hordes of Bugbears or something like that. The PCs are level 9 the goal is surviving the night. If anyone has any suggestions on interesting encounters plkease feel free to suggest them and feel free to ignore the CR guidelines as if the Drow bring up an ancient Deep Dragon with them so be it along with Mind Flayer allies etc. The players have high rolles stats (Paladin with 18 strength and 20 charisma) and there will be 5 of them.
There is no reward or goal they annoyed the local assassins and now its payback time. All they have to do is survive the night. I won't be to upset if a PC or 3 dies as they have access to raise dead.
Drow Archer
Drow Archer (gladiator reskin) CR6
Medium Humanoid (any race) chaotic evil
Armor Class 17 (chain shirt,)
Hit Points 112 (15d8+45)
Speed 30 ft.
Saving Throws Dex +7, Con +6, Wis +4
Str 15 (+4), Dex 18 (+4), Con 16 (+3), Int 10 (+0), Wis 12 (+1), Cha 15 (+2)
Skills Intimidation +5, Stealth +7,
Senses passive Perception 11
Languages Any one language (usually common
Challenge 6 (2300 XP)
Superior Magic Resistance: 13
Skilled. A ranged weapon a +2 bonus to hit when the Drow with it (included in the attack)
Equipment (all Drow), Boots of Elvenkind, Cloak of Elven Kind, +1 hand crossbow, +1 chain shirt, +1 buckler, 4 dose drow poison.
Actions.
Multiattack. The archer makes two melee attacks or three ranged attacks.
Shortsword. Melee or ranged Weapon Attack: +18 to hit,. Hit 11 (1d6+5) piercing damage
Hand Crossbow +10 to hit, 1d6+4 piercing damage + 3d6 poison damage (DC13 con save, poisoned 1 hour/unconscious if failed by 5 or more)
Drow traits (page 128 MM)
Drow Assassin CR 9
Medium Humanoid (any race) chaotic evil
Armor Class 19 (chain shirt, buckler,)
Hit Points 136 (18d8+45)
Speed 30 ft.
Saving Throws Dex +7, Con +6, Wis +4
Str 15 (+4), Dex 20 (+5), Con 16 (+3), Int 10 (+0), Wis 12 (+1), Cha 15 (+2)
Skills Intimidation +5, Stealth +7,
Senses passive Perception 11
Languages Any one language (usually common
Challenge 6 (2300 XP)
Superior Magic Resistance: 14
Skilled. A melee weapon deals one extra dice of damage when the drow hits with it (included in the attack)
Equpment (all Drow), Boots of Elvenkind, Cloak of Elven Kind, +1 short sword, +1 chain shirt, +1 buckler, 4 dose drow poison.
Actions.
Multiattack. The assassin makes 3 melee attacks or two ranged attacks.
Shortsword. Melee or ranged Weapon Attack: +8 to hit, Hit 11 (2d6+5) piercing damage + 7d6 poison damage.
Hand Crossbow +8 to hit, (DC13 con save, poisoned 1 hour/unconscious if failed by 5 or more)
Assassin Traits (Assassinate, Evasion, Sneak Attack) Page 343 MM
Drow traits (page 128 MM)
Keep us updated on the death count 
I ran this idea today. The 1st encounter was 4 levitating Drow archers. PCs started using dispel magic on them. The next encounter was 20 bugbears they all died in a hurry to AoE spells and the party has wand of lighting and a staff of the storm. The 3rd fight was 6 goblins armed with firepots which summoned a huge fire elemental (as MM FE with X2 hit points and +2 to hit, damage and DCs) backed up by a greater invisability Drow mage. All Drow got tweaked to use superior magic reistance which is a static nuumber the PCs have to roll to beat generally 10+1 for evey 2 CR of the Drow.