看到现在很多人不明白"Sin"这项数值的作用，我直接从英文wiki翻译过来一篇文章，首先说说辉石镇那个赎罪牧师的作用，他的作用和sin没有什么直接关系，他的作用是：当你攻击了某个npc使其进入敌对状态但又还未杀死那个NPC时，去赎罪牧师那里交等级x100的赎罪款，就可以把所有敌对NPC的状态重置为友好，但如果你已经杀了某个NPC，交赎罪款也无济于事，只能用墓碑去复活那个NPC

下面是wiki文章的翻译：

Sin

Sinning increases your chances of being invaded by arbiter spirits (Blue Sentinels)
　　罪恶值会增加你被蓝魂入侵的几率。

Arbiter spirits can invade you after your sin level reaches "sinner" (10 points of sin)
　　当你的罪恶值到达10（变成“罪人”）时候，蓝魂就会开始入侵你。

There are three levels of sin; "-","sinner", and "wretch".

"-" is 0-9 points of sin

"sinner" is 10-99 points of sin

"wretch" is 100+ points of sin

Attacking NPCs adds 1 point of sin
　　罪恶值有3个等级，0-9时为“无”，10-99为“罪人”，100以上为“wertch”（玩的英文版，不知道中文版这个怎么翻译）

The trigger for incrementing sin appears to occur when the player absorbs the souls of an "innocent" NPC. So even if the player lures monsters near an NPC and waits while they kill him/her, it still counts as a sin. (Tested on PC version 1.01 while watching the memory location for sin count)
　　当你吸了某个NPC的魂之后就会计算你的罪恶值，所以把怪引到NPC旁边砍死NPC也算你的罪行（PC版1.01分析内存确定）

Invading using the Cracked Red Eye Orb and successfully defeating the host adds 1 point of sin
　　变成红魂入侵别人增加1点罪恶值

Killing a host as a black phantom for the Bell Keepers does not count as a sin.
　　钟卫契约下入侵别人不算罪行

Being killed by an arbiter spirit removes 1 point of sin
　　被蓝魂杀死一次减1点罪恶值

Sin does not reset after completing a play through
　　罪恶值每周目不会重置

Cromwell the Pardoner does not reset your sin level. His pardon mechanic only removes the aggro from hostile NPCs.
　　赎罪牧师不能重置你的罪恶值，只能消除敌对NPC的敌意

Using the Crushed Eye Orb to invade and kill Licia of Lindelt is considered a sin (confirmed, killing her raised my sin level from "-" to "sinner"(my sin count was at 9 when I killed her, I had just dropped out of sinner status from being killed by a blue sentinel)) (I just did this, got roughly 3000 souls for killing her but my sin has not changed from "-". Im a member of the Blue Sentinels, perhaps that makes a difference when invading Licia? PC version 1.02)(PC version 1.02, killed Licia but my sin didnt changed) (You people need exactly 9 points of sin for it to be a visible change.)
　　入侵拜金女会增加罪恶值

Unconfirmed/Untested:

未被证实/测试的消息：

Killing either Creighton the Wanderer or Mild Mannered Pate during their quarrel does not add sin?

Killing either is a sin. Even standing back and watching will count as a sin once one dies since the game seems to consider absorbing souls of an "innocent" NPC a sin. (Tested on PC version 1.01 while watching the memory location for sin count)

However, attacking either NPC while they fight is not considered an aggression as Cromwell will say you havent sinned after the fight. The sin increment from witnessing this fight may be an oversight in programming and may be fixed in future updates.
　　杀掉辉石镇二人组中的任何一个会被算作罪行吗？会，就算你一直坐山观虎斗，其中一个死了也会算你的罪行。

The Lost Sinners Sword can be used to determine sin level below 10 points?
　　罪人之剑可以用来测试罪恶值是否在10以下？

Does attacking non hostile bosses count as a sin? (vendrick/ancient dragon)

Killing Vendrick is not a sin. (Tested on PC version 1.01 while watching the memory location for sin count)

Killing the Ancient Dragon is also not a sin, whether you talk to him before fighting or not. (Tested on PC version 1.02)
　　攻击非敌对boss算罪行吗？杀老王不算罪行，杀古龙也不算，不管你是否先跟它说过话。

Can sin be lowered back down to "0" by getting killed by an arbiter spirit, while playing as a white/gold phantom?
　　当自己是白魂/金魂时候被蓝魂杀死能把罪恶值降回“0”吗？

Does killing the host during a dragon eye duel count as a sin?

Killing the host during a dragon eye duel does not count as a sin (Tested on PC version 1.02)
　　古龙教跟别人决斗时候算罪行吗？不算。