Red Hand of Doom 5e Conversion Guide [Spoilers, WIP, PEACH]

[Moradin]

OK, so in the modifications to Lost Mines of Phandelver posted above I hinted to a Miha Serani doppelganger. I think that makes sense as a shapeshifter that can read thoughts without using magical means would go a long way as a spy. Therefore, I am proposing today an alternative build to Miha Serani: a Sorc7 doppelganger.

Spoiler: Miha Serani

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Miha Serani (Medium shapeshifter, Sorc7)
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Armor Class 17 (natural)
HP 110 (8d8+7d6+37)
Speed 9 m (30 ft)
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Str 0, Dex +4, Con +2
Int +1, Wis +1, Cha +4
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Saving Throws Con +5, Cha +7;
Skills Deception +9, Insight +4;
Condition Immunities Charmed;
Senses darkvision 60 ft, passive Perception 11;
Languages Common, Goblin, Draconic
CR 6 (2300 XP)
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Shapechanger. Miha can use its action to polymorph into a Small or Medium humanoid it has seen or back into her true form. She prefers to assume the form of a middle aged woman she killed long ago, the original travelling sorceress Miha Serani. Her statistics, other than her size, are the same in each form. Any equipment she is wearing or carrying isn't transformed. She reverts to her true form if she dies.

Ambusher. In the first round of a combat, Miha has advantage on attack rolls against any creature she surprised.

Surprise Attack. If she surprises a creature and hits it with an attack during the first round of combat, the target takes an extra 10 (3d6) damage from the attack.

Draconic Resilience Miha refined her arcane arts under the guide of Tyrgarun, the blue dragon. Hence, her AC is equal to 13 + D when she is not wearing armor. Her HP are increaed by 1 for each of her class levels. In her natural form, her skin is covered by small dragon-like blue scales.
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ACTIONS
Multiattack. Miha makes two melee attacks.

Slam. Melee Weapon Attack: +6 to hit, reach 5 ft., one target.
Hit: 7 (1d6 + 4) bludgeoning damage.

Read Thoughts Miha magically reads the surface thoughts of one creature within 60 feet of it. The effect can penetrate barriers, but 3 feet of wood or dirt, 2 feet of stone, 2 inches of metal, or a thin sheet of lead blocks it. While the target is in range, she can continue reading its thoughts, as long as her concentration isn't broken (as if concentrating on a spell). While reading the target's mind, she has advantage on Wisdom (Insight) and Charisma (Deception, Intimidation, and Persuasion) checks against the target.
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Metamagic the first time she is met, Miha has at her disposal 12 sorcery points and can gain others sacrifying spell slots. Miha can use these sorcery points to apply the following Metamagic feats to her spells:

Twinned Spells (1 sorcery point/spell level): Miha can select a second targed for one of her spells. Only spells with a target of "one creature" are elegible to be modified using this feat.

Subtle Spells (1 sorcery point): Miha can cast a spell without any somatic or verbal component.

Spellcasting Miha is a 8th-level spellcaster. Her spellcasting ability is Charisma DC 15 for her spells, +7 to attack). She knows the following sorcerer spells:
0. Friends, Mage Hand, Minor Illusion, Ray of Cold, Message;
1. (3 slots) Chromatic Orb, Charm Person, Shield, Magic Missile;
2. (3 slots) Suggestion;
3. (2 slots) Lightning Bolt, Fear;
4. (1 slot) Blight.

Notable equipment: Miha carries 2 potions of Cure Wounds (4d8+4), a potion of Fly and 2 of Invisibility, and 45 gp in coins. She wears a Robe of Useful Items (6000 gp). In the special pockets, the robe contains an iron door that autofits any opening smaller than a regular door (max 3x1.5 m), a six-seats wooden boat with 4 oars (length 4.5 m), a toothbrush, freshly cleaned socks and underclothing, a potion of Giant Strength (Str 21), a scroll of Silence, a 1 m³ block of ice and a fully cooked 10 kg turkey.

Tactics: As explained extensively in the adventure and in this thread, Miha represents a danger far greater than her hand to hand capabilities. She is a master spy and uses her Shapechanger and Read Thought abilities to great effect. If she suspects the player she is speaking to thinks she's a spy, she uses Subtle spells to cast Suggestion, Charm Person or Friends to keep her facade going for a little longer. She figures she just needs one character on her side to be secure. If she is not able to bring the character she is speaking to on her side, she uses her Ambusher and Surpise Attack to slam her opponent. She then drinks a potion of Invisibility and/or Fly and tries to make a run for it. If she is cornered and cannot escape, she opens with a twinned Blight on the closest target, Fear or Lightning Bolt if she can catch more than one player in the area of the spell. Agains magic users, she tends to cast a twinned 2nd level Chromatic Orb (2x4d8). Every day, she sacrifies a cantrip, a 1st level slot and a 3rd level slot to increase her sorcery points to 12. If she needs extra points, she tends to sacrifice her 3rd level slots.
Reward: Miha is a single creature, so even if there is a real possibility that she takes the characters by surprise, the fight should be pretty straightforward and PCs should not be in any real danger. Therefore, if the do not realize she is a spy prior to the breaking of the fight, she's worth 2300 XP, as CR 6. If instead PCs realize she is indeed a spy, I am planning to award them with 5000 xp for this encounter (+2 VP).