Deva
The devas are a group of angelic beings added in SLASH'EM. They are all characterized by strong physical attacks, high speed, and clerical spellcasting, similar to aligned priests. They are most often encountered as minions, either given to lawful characters through prayer[1] or sacrifice[2], or created when attempting to convert a lawful altar. As minions, they are quite powerful, and can be a useful source of shields of reflection or even artifact weapons, which they have a chance of starting with.
Movanic deva
A movanic deva 
| |
|---|---|
| Difficulty | unknown |
| Attacks |
Weapon fire 3d4, Weapon fire 3d4, Claw 3d4, Spellcasting (clerical) 2d6 |
| Base level | 12 |
| Base experience | unknown |
| Speed | 18 |
| Base AC | -5 |
| Base MR | 90 |
| Alignment | 15 (lawful) |
| Frequency (by normal means) | Very rare, appears only outside of Gehennom |
| Genocidable | No |
| Weight | 1450 |
| Nutritional value | 400 |
| Size | Medium |
| Resistances | death magic |
| Resistances conveyed |
None |
|
A movanic deva:
| |
| Reference | SLASH'EM 0.0.7E7F2/monst.c#line1945 |
The movanic deva is the weakest of the devas. It is still a formidable opponent, particularly if one lacks fire resistance, as its attacks will then burn you. It is able to cast clerical spells, including possibly curse items.
Monadic deva
A monadic deva 
| |
|---|---|
| Difficulty | unknown |
| Attacks |
Weapon 3d4, Weapon 6d4, Claw 3d4, Spellcasting (clerical) 3d4 |
| Base level | 15 |
| Base experience | unknown |
| Speed | 18 |
| Base AC | -4 |
| Base MR | 90 |
| Alignment | 15 (lawful) |
| Frequency (by normal means) | Very rare, appears only outside of Gehennom |
| Genocidable | No |
| Weight | 1450 |
| Nutritional value | 400 |
| Size | Medium |
| Resistances | death magic |
| Resistances conveyed |
None |
|
A monadic deva:
| |
| Reference | SLASH'EM 0.0.7E7F2/monst.c#line1954 |
Monadic devas are slightly stronger than movanic devas, and are distinctive in that their physical attacks do only normal damage. Still, they are quite formidable opponents, similar in level to an Angel but much faster. They are also able to cast powerful clerical spells.
Astral deva
A astral deva 
| |
|---|---|
| Difficulty | unknown |
| Attacks |
Weapon 3d12, Weapon stun 1d4, Spellcasting (clerical) 3d4 |
| Base level | 18 |
| Base experience | unknown |
| Speed | 18 |
| Base AC | -6 |
| Base MR | 90 |
| Alignment | 15 (lawful) |
| Frequency (by normal means) | Very rare, appears only outside of Gehennom |
| Genocidable | No |
| Weight | 1450 |
| Nutritional value | 400 |
| Size | Medium |
| Resistances | death magic |
| Resistances conveyed |
None |
|
An astral deva:
| |
| Reference | SLASH'EM 0.0.7E7F2/monst.c#line1962 |
The toughest of the devas, astral devas are almost equivalent to an Archon in difficulty. They do similar amounts of physical damage, and while the astral deva cannot stun and blind with its gaze, it can stun with its physical attacks. The astral deva is also slightly faster than the Archon, with a speed of 18 over the Archon's 16. They are almost the same base level (18 for the astral deva versus 19 for the Archon), and are both spellcasters. Luckily, the astral deva is unable to summon nasties, as it can only cast clerical spells, which summon nasties luckily is not.
Strategy
The devas, with the Planetars and Solars, constitute one of the chief reasons that lawful alignment is very nice in SLASH'EM. Not only are these dangerous monsters always peaceful to you, but you have a very good chance of receiving a number of them as pets, both from altars and occasionally from praying while in trouble. Additionally, receiving them as minions from sacrificing does not increase your prayer timeout, and so does not even require that much time or nutrition.
If you are not lawful, these are all formidable opponents. It should be noted that, "in the wild," these monsters are all quite rarely seen, particularly since they cannot appear in Gehennom and are relatively high-level. However, one should think twice about converting lawful altars in SLASH'EM. It is better to convert altars at lower experience levels, since then easier couatls and Aleaxes will be created instead of devas. It is best, in fact, to convert altars below experience level 4, since then no minions will be created.
In combat, it is good to keep in mind that devas are not guaranteed a shield of reflection, unlike Archons, although they do have a reasonable chance of having one. They all resist death rays, but no other types of damage. Thus, attack wands work well against them, although their high MR of 90 means that wands of sleep, striking and magic missile are likely to be ineffective. If they do have a shield of reflection, wands of draining and wands of fireball are good choices against them, since they resist neither and neither can be reflected. Stoning is also a good choice if it is available; since they do not summon nasties, however, a cockatrice corpse is less likely to be around. Escape items, in particular wands or scrolls of teleportation, are recommended as a back-up plan, in light of their high speed and the fact that they will follow you from level to level if adjacent to you.
