NPC bit flags

Bit flags are special traits that can be programmed into NPCs to give them certain abilities. These bits are listed in the help_npc.txt file in the user folder under BitOn, which includes instructions on how to use them in a custom NPC. The reference to 'bits' is related to how they are set in a programming manner. They are a combination of feats and special actions, but as a combination of the two they are in their own category.

NPC Bit flags

The list starts at 5 as there are no bits that can be set under that number.

Name	Number	Game version	Ingame ID
cFloat	5	Any	32
Floats the NPC. Among other things, it saves them from acid pools, deaths when drinking from wells, and triggering traps.
cInvisi	6	Any	64
The NPC is invisible. They can only be seen by the player when they are wet, or when the player has an item that lets them see invisible creatures equipped. NPCs with the cSeeInvisi bit can still see them. A pet that is invisible will still be seen by NPCs, regardless of the NPCs' ability to see invisible creatures.
cSeeInvisi	7	Any	128
The NPC can see invisible creatures.
cResConfuse	8	Any	256
Immunity to confusion. But, it does not stop insanity from inflicting the status effect.
cResBlind	9	Any	512
Immunity to blindness. But, it does not stop insanity from inflicting the status effect.
cResFear	10	Any	1024
Immunity to fear. But, it does not stop insanity from inflicting the status effect.
cResSleep	11	Any	2048
Immunity to sleep. But, it does not stop insanity from inflicting the status effect.
cResParalyze	12	Any	4096
Immunity to paralyzation. But, it does not stop insanity from inflicting the status effect.
cResPoison	13	Any	8192
Immunity to poison. But, it does not stop insanity from inflicting the status effect.
cEater	14	Any	16384
Able to eat rotten food without triggering any of its negative effects.
cResSteal	15	Any	32768
Resists Suspicious Hand events.
cIncognito	16	Any	65536
Possibly causes the NPC to not be targeted automatically by hostile monsters.
cDropGold	17	Any	131072
When killed, automatically drops all gold held at the time of death.
cSuicide	18	Any	262144
Has a chance to trigger the Suicide attack special action, when hit.
cDeathMaster	19	Any	524288
Auto-triggers the Word of Death special action. The effect cancels out when the casting NPC is killed.
cRapidMagic	20	Any	1048576
Allows for multiple casting of dart-type spells in a single turn. This can be observed on the Exile servant.
cLayHand	21	Any	2097152
The NPC can cast a major healing spell on heavily damaged allies. This can be observed on the Defender servant.
cHorse	22	Any	4194304
The NPC works well with the riding skill. It gives the message "You feel comfortable" when ridden.
cSplit	23	Any	8388608
The first version of the split ability. The NPC can create a copy when any damage is taken. Copies of the NPC will keep the status effects inflicted on the one that spawned them.
cEncCurse	23	Any	16777216
???
cNoHorse	25	Any	33554432
The NPC works very poorly with the riding skill, resulting in a severe speed penalty when ridden.
cResEle	26	Any	67108864
The NPC has near immunity to elemental attacks, except pure magic. This is observable with cubes.
cSplit2	27	Any	134217728
The second type of split ability. The NPC can create a copy when any damage is taken. The copies do not have the status effects inflicted on the original.
cMetal	28	Any	268435456
Any damage inflicted on the NPC with this is severely reduced. Observable with bell-type monsters such as the gold bell.
cCureBleeding	29	Any	536870912
???
cPowerBash	30	Any	1073741824
Allows the NPC to break walls, similar to the PC's bash command. Bosses and uniques use this.
cImmuneMine	31	Any	2147483648
Prevents triggering of mines by the character. Used by mine layers such as the mine dog to prevent it setting off its own traps.
cTemper	32	Elona beta (after 1.16)	4294967296
Activates a self-buff that causes the character to take more damage in exchange for doing more damage.
cArmour	33	Elona Plus (Any version)	8589934592
Damage inflicted on the NPC is reduced. Less effective than the cMetal flag.