Lesser Paraelemental of Magma

Second edition AD&D failed to make paraelementals for Dark Sun, so I will be creating some. I've decided to start with the lesser paraelementals and eventually get to the greater paraelementals.
I'm continuing with the lesser paraelemental of magma. Feedback is welcome.

Grrrr! Argh!

Stats after the jump


Lesser Magma Paraelemental
Climate/Terrain: Magma
Frequency: Rare
Organization: Solitary
Activity Cycle: Day
Diet: Magma
Intelligence: Low (5-7)
Treasure: Nil
Alignment: Neutral
No. Appearing: 1
Armor Class: 4
Movement: 6
Hit Dice: 2, 4, or 6
Thac0: 2 Hit Dice: 19
            4 Hit Dice: 17
            6 Hit Dice: 15
No. of Attacks: 1
Damage/Attacks: 2 Hit Dice: 1-6
                             4 Hit Dice: 2-12
                             6 Hit Dice: 3-18
Special Attack: See Below
Special Defense:+1 or better weapon to hit
Magic Resistance: Nil
Size: S-M (2'-6') Height = HD
Morale: 2 HD: Steady (11-12)
             4 - 6 HD: Elite (13-14)
XP Value: 2 Hit Dice: 420
                 4 Hit Dice: 650
                 6 Hit Dice: 975

Lesser Magma Paraelemental
From the waist up, a lesser magma paraelemental resembles a stocky humanoid being, but the lower portion of its body is nothing but an amorphous mass of molten stone. Most of its upper body is black rock, but a reddish heat shines from within – particularly from the eyes and mouth of the creature. Lesser magma paraelementals enjoy melting solid objects into liquid forms.
Combat
When it comes to combat, the magma paraelemental uses its super-heated touch to inflict damage to a victim and sets combustibles (like wood) aflame. Any flammable object struck by the lesser magna paraelemental must save versus magic fire with a +1 penalty or immediately begin to burn. Targets within one yard of a lesser magma paraelemental take 1 point of damage from the creature's radient heat. Natural weapon used against a magma paraelemental inflict 1d4 heat damage against the attacker, if the attacker strikes the paraelemental.
Lesser magma paraelementals can be struck only by +1 or better weapons, and they’re immune to the effects of heat and flame. They suffer normal damage from cold-based attacks. However, if they sustain a number of points of cold damage equal to their Hit Dice – in other words, if an 4-HD paraelemental suffers 4 points of cold damage – the cold affects them as would a slow spell.
All damage against magma or fire-based creatures is automatically halved. In addition, conjuring/summoning a lesser magma paraelemental during the cold Athasian nights is a risky proposition at best. If exposed to the cold of the night , the lesser magma paraelemental may not last the full length of its conjuration/summoning. After 5 rounds in the cold, the creature must make a successful saving throw versus death magic or return to the Paraelemental Plane of Magma.