EDIT: Since there is an official 4e conversion, I shan't be updating these guys to MM3 standards. Unless someone really wants me to.
DARKMANTLE--- Level 1 Lurker
Medium fey beast--- XP 100
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Initiative +4; Senses Perception +5, blindsight 10
HP 25; Bloodied 12
AC 15; Fortitude 15; Reflex 12; Will 12
Speed 3, fly 5
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[Melee Basic] Smashing Blow (standard; at will): The darkmantle rams its body into its foe. +6 vs. AC; 1d10+3 damage.
[Melee] Death From Above (standard; recharge 6): Only when the darkmantle begins its turn above the target; +6 vs. AC; 2d6+3, the target is grabbed (until escape). If the darkmantle has combat advantage, it deals an additional 1d6 points of damage with this attack.
[Melee] Squeeze (standard; only against grabbed target; at will): +4 vs. Fort; 2d6+3 damage.
Curtain of Darkness (minor; encounter): Burst 2 within 6. Creates a zone of darkness that remains in place until the end of the darkmantle’s next turn. The zone blocks line of sight and all creatures within it are blind until they exit the area.
Stalactite Disguise: A darkmantle looks like a normal stalactite. It requires a Perception check, DC 25, to notice one before it acts.
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Alignment unaligned; Languages -
Skills Perception +5, Stealth +5
Str 16; Dex 10; Wis 10
Con 13; Int 2; Cha 10
LESSER DARKMANTLE--- Level 1 Minion
Medium fey beast--- XP 25
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Initiative +4; Senses Perception +5, blindsight 10
HP 1; a missed attack never damages a minion.
AC 15; Fortitude 14; Reflex 12; Will 12
Speed 3, fly 5
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[Melee Basic] Smashing Blow (standard; at will): The darkmantle rams its body into its foe. +5 vs. AC; 4 damage.
[Melee] Death From Above (standard; encounter): Only when the darkmantle begins its turn above the target; +5 vs. AC; 6 damage and the target is grabbed (until escape).
[Melee] Squeeze (standard; only against grabbed target; at will): +4 vs. Fort; 5 damage.
Stalactite Disguise: A darkmantle looks like a normal stalactite. It requires a Perception check, DC 25, to notice one before it acts.
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Alignment unaligned; Languages -
Skills Perception +5, Stealth +5
Str 14; Dex 10; Wis 10
Con 13; Int 2; Cha 10