Spiny

Version 0.16: This article may not be up to date for the latest stable release of Crawl.

Anything careless enough to attack a spiny creature in melee will take damage from the defender's spines. Ranged or reaching attacks ignore this counterattack, as do spells.

Monster Version

Each time anything attacks a spiny monster in melee, there is a chance that the attacker will take Nd4 damage (Nd3 if the attacker is a monster), where "N" is the defender's spiny degree. This damage ignores EV, but is reduced by random2(AC/2).

Player Version

You can acquire the spiny trait yourself by gaining the demonspawn spiny mutation. Spiny players may hurt attackers with a probability which depends on how many levels of the spiny mutation they have, as well as the encumbrance rating of their body armour; heavier armour reduces the effectiveness of one's spines:

Spiny Damage
Spiny 1: 2d5 - AC - Encumbrance Rating/3.
Spiny 2: 2d5 or 3d5 (equal odds) - AC - Encumbrance Rating/3.
Spiny 3: 3d5 - AC - Encumbrance Rating/3.

As with monster spines, this ignores EV. However, you can only affect the first attack of any given monster per round.

Spiny Monsters

r Porcupine(3 degrees)

P Briar patch(4 degrees)

1 Hell sentinel(5 degrees)