Sharp Eyes 20 book will not work.

I have tested this on a new character level 130, without GM status and got the book to work 5 out of 6 times. (kept changing the skill mastery level back down via the database). It's pretty impossible that your character could be bugged. I think you are just very unlucky =/

 

Here is the skillbook handler script which you can examine if you like:

Code:

public SkillBookHandler() {
	}

	public void handlePacket(SeekableLittleEndianAccessor slea, MapleClient c) {
		if (!c.getPlayer().isAlive()) {
			c.getSession().write(MaplePacketCreator.enableActions());
			return;
		}
		slea.readInt();
		byte slot = (byte) slea.readShort();
		int itemId = slea.readInt();
		MapleCharacter player = c.getPlayer();
		IItem toUse = c.getPlayer().getInventory(MapleInventoryType.USE).getItem(slot);
			
		if (toUse != null && toUse.getQuantity() == 1) {
			if (toUse.getItemId() != itemId) {
				return;
			}
			MapleItemInformationProvider ii = MapleItemInformationProvider.getInstance();
			Map<String, Integer> skilldata = ii.getSkillStats(toUse.getItemId(), c.getPlayer().getJob().getId());
			
			boolean canuse = false;
			boolean success = false;
			int skill = 0;
			int maxlevel = 0;
			if (skilldata == null) { // Hacking or used an unknown item
				return;				
			}
			if (skilldata.get("skillid") == 0) { // Wrong Job
				canuse = false;
			} else if (player.getMasterLevel(SkillFactory.getSkill(skilldata.get("skillid"))) >= skilldata.get("reqSkillLevel") || skilldata.get("reqSkillLevel") == 0) {
				canuse = true;
				int random = (int) Math.floor(Math.random() * 100) + 1;				
				if (random <= skilldata.get("success") && skilldata.get("success") != 0) {
					success = true;
					ISkill skill2 = SkillFactory.getSkill(skilldata.get("skillid"));
					int curlevel = player.getSkillLevel(skill2);
					player.changeSkillLevel(skill2, curlevel, skilldata.get("masterLevel"));
					MapleInventoryManipulator.removeFromSlot(c, MapleInventoryType.USE, slot, (short) 1, false);
				} else {
					success = false;
					MapleInventoryManipulator.removeFromSlot(c, MapleInventoryType.USE, slot, (short) 1, false);
				}				
			} else { // Failed to meet skill requirements
				canuse = false;					
			}
			player.getClient().getSession().write(MaplePacketCreator.skillBookSuccess(player, skill, maxlevel, canuse, success));
		} else {
			return;
		}
	}
}

So basically it chooses a random number between 0 and 100, if the chosen number is less than or equal to the success % (which would be 70), then continue the script and apply the mastery increase.

It gets the skill data from the wz xml files on the data by using this script in skillfactory:

Code:

public static ISkill getSkill(int id) {
		ISkill ret = skills.get(Integer.valueOf(id));
		if (ret != null) {
			return ret;
		}
		synchronized (skills) {
			// see if someone else that's also synchronized has loaded the skill by now
			ret = skills.get(Integer.valueOf(id));
			if (ret == null) {
				int job = id / 10000;
				MapleData skillroot = datasource.getData(StringUtil.getLeftPaddedStr(String.valueOf(job), '0', 3) + ".img");
				MapleData skillData = skillroot.getChildByPath("skill/" + StringUtil.getLeftPaddedStr(String.valueOf(id), '0', 7));
				if (skillData != null) {
					ret = Skill.loadFromData(id, skillData);
				}
				skills.put(Integer.valueOf(id), ret);
			}
			return ret;
		}
	}

 

Mhmmm in my opinion I don't think people should base their luck on having failed or succeeded so many scrolls/books in a row. It's a certain chance on each attempt, having failed so many in a row doesn't mean you are more likely to pass the next one. For chaos scrolls for example, it's pretty much a 50/50 chance. And it's very possible to fail or pass 20+ in a row. I know you probably know this and feel the same way but just putting this out there.