Well this is actually quite a difficult assignment as you are both specific and vague at the same time. For some reason I couldn’t find an “Angel of Torment” stat block to reference so I have gone with my own gut.
From what little I know of Glasya I find it quite unlikely she would have actual Angels so I have made the creature a devil summoned from Malbolge as part of a bargain with your wounded succubus. As you stated you had a fiery miniature you wanted to use I have themed the creature fairly heavily on that element.
Anyway here is a first draft.
Champion of Glasya Level 19 Elite Skirmisher (Leader)
Medium Immortal Humanoid (devil) XP 4,800
Initiative +22 Senses Perception +17, darkvision
Flames of Suffering (fire) aura 5; All enemies inside aura take a -2
penalty to saving throws and take 5 fire damage whenever they pass a
saving throw (this damage ignores fire resistance)
HP 364; Bloodied 182; on death see The Mistress Beckons
AC 33; Fortitude 31, Reflex 32, Will 32
Saving Throws +2
Speed 6, fly 8 (clumsy)
Action Points 1
Sickle Slice (Standard; at-will) ♦ fire
Attack +24 vs. AC; 2d10+14 damage; on hit if Champion has combat
advantage the target also takes 10 ongoing fire damage (save ends)
Whip Crack (Standard; at-will)
Reach 3; attack +22 vs. Reflex; 2d8+14 damage; on hit target is slowed
(save ends)
Mobile Assault (Standard; at-will)
Champion makes a Sickle Strike and Whip Crack attack in any order and
may shift 3 square between attacks
Triple Headed Lash (Standard; recharge 
)
Reach 3; 3 attacks against the same target:
1. Attack +22 vs. Fortitude; 2d8+10 damage; on hit slide target 3 squares
after resolving all attacks from this power
2. Attack +22 vs. Reflex; 2d8+10 damage; on hit target takes 10 ongoing
fire damage (save ends), if the target is already taking ongoing fire
damage it is instead increased by 5 for the appropriate duration
3. Attack +22 vs. Will; 2d8+10 damage; on hit target is dazed (save ends)
Call Out The Pain (Standard; encounter) ♦ fire
Burst 5; enemies only; attack +22 vs. Fortitude; 3d10+15 fire damage; on
hit target gain vulnerability 5 all (save ends); on miss target takes half
damage
Retribution of Glasya (Immediate Reaction; recharge
) ♦ triggered
action
When an ally within 10 squares of Champion is hit by an attack from an
adjacent enemy the triggering enemy takes fire damage equal to half the
damage dealt and is immobilised until the end of its next turn
The Mistress Beckons (Free) ♦ triggered action
When reduced to 0 HPs Champion returns (teleports) to Malbolge leaving a
fiery wake; burst 5; creates a zone that lasts until the end of the
encounter all creatures entering or starting their turn inside the zone take
15 fire damage
Alignment Evil Languages common, supernal
Skills Arcana +18, Bluff +20, Diplomacy +20, Endurance +20, Insight +17,
Religion +18
Str 24 (+16) Dex 25 (+16) Wis 16 (+12)
Con 22 (+15) Int 18 (+13) Cha 22 (+15)
Equipment 3 headed whip, flaming sickle
Well I’m not 100% happy with it but in theory it certainly seems to be able to kick out a continuous stream of damage. Anyway I hope you find it interesting.
From what little I know of Glasya I find it quite unlikely she would have actual Angels so I have made the creature a devil summoned from Malbolge as part of a bargain with your wounded succubus. As you stated you had a fiery miniature you wanted to use I have themed the creature fairly heavily on that element.
Anyway here is a first draft.
Champion of Glasya Level 19 Elite Skirmisher (Leader)
Medium Immortal Humanoid (devil) XP 4,800
Initiative +22 Senses Perception +17, darkvision
Flames of Suffering (fire) aura 5; All enemies inside aura take a -2
penalty to saving throws and take 5 fire damage whenever they pass a
saving throw (this damage ignores fire resistance)
HP 364; Bloodied 182; on death see The Mistress Beckons
AC 33; Fortitude 31, Reflex 32, Will 32
Saving Throws +2
Speed 6, fly 8 (clumsy)
Action Points 1

Attack +24 vs. AC; 2d10+14 damage; on hit if Champion has combat
advantage the target also takes 10 ongoing fire damage (save ends)

Reach 3; attack +22 vs. Reflex; 2d8+14 damage; on hit target is slowed
(save ends)

Champion makes a Sickle Strike and Whip Crack attack in any order and
may shift 3 square between attacks



Reach 3; 3 attacks against the same target:
1. Attack +22 vs. Fortitude; 2d8+10 damage; on hit slide target 3 squares
after resolving all attacks from this power
2. Attack +22 vs. Reflex; 2d8+10 damage; on hit target takes 10 ongoing
fire damage (save ends), if the target is already taking ongoing fire
damage it is instead increased by 5 for the appropriate duration
3. Attack +22 vs. Will; 2d8+10 damage; on hit target is dazed (save ends)

Burst 5; enemies only; attack +22 vs. Fortitude; 3d10+15 fire damage; on
hit target gain vulnerability 5 all (save ends); on miss target takes half
damage
Retribution of Glasya (Immediate Reaction; recharge


action
When an ally within 10 squares of Champion is hit by an attack from an
adjacent enemy the triggering enemy takes fire damage equal to half the
damage dealt and is immobilised until the end of its next turn
The Mistress Beckons (Free) ♦ triggered action
When reduced to 0 HPs Champion returns (teleports) to Malbolge leaving a
fiery wake; burst 5; creates a zone that lasts until the end of the
encounter all creatures entering or starting their turn inside the zone take
15 fire damage
Alignment Evil Languages common, supernal
Skills Arcana +18, Bluff +20, Diplomacy +20, Endurance +20, Insight +17,
Religion +18
Str 24 (+16) Dex 25 (+16) Wis 16 (+12)
Con 22 (+15) Int 18 (+13) Cha 22 (+15)
Equipment 3 headed whip, flaming sickle
Well I’m not 100% happy with it but in theory it certainly seems to be able to kick out a continuous stream of damage. Anyway I hope you find it interesting.