Agon gets you the stat block. Yes, this is a hard encounter. Yes, I think you guys can handle it.
devils:
Brazen Devil Guard
Large immortal humanoid (devil)
Level 27 Soldier
XP 11000
Initiative +19 Senses Perception +25; Darkvision
HP 249; Bloodied 124
AC 43; Fortitude 40, Reflex 37, Will 38
Resist 30 fire
Speed 7, fly 7 (clumsy)
Trident (standard, at-will) Weapon
Reach 2; +34 vs AC; 2d12+8 damage, and the target slides 1 square.
Disgorge Hellfire (standard, recharges when first bloodied) Fire
Close blast 5; +32 vs Reflex; 2d10+10 fire damage, and the target loses all resistances until the end of the brazen guard’s next turn.
Furious Assault (standard, encounter) Teleportation
Reach 2; +32 vs Fortitude; 2d12+8 damage, the target is pushed 3 squares, and the brazen devil guard teleports to a space adjacent to the target at the end of the push.
Fiendish Opportunist (immediate reaction, when an enemy is pushed, pulled, or slid into a square adjacent to the brazen devil, at-will) Weapon
+32 vs Fortitude; 2d12+5 damage, and the target is knocked prone.
Infernal Assault (move; encounter) Teleportation
The brazen devil guard teleports 20 squares and gains a +2 bonus to attack rolls until the start of its next turn. The brazen devil guard can teleport into occupied squares, sliding any creatures occupying those squares into the nearest unoccupied squares.
Alignment Evil Languages Supernal
Skills Intimidate +24
Str 28 (+22) Dex 18 (+17) Wis 25 (+20)
Con 25 (+20) Int 23 (+19) Cha 22 (+19)
Equipment: hellforged plate armor (destroyed if brazen devil is reduced to 0 hit points), trident .