Share] A real Anti-Buff Shield

L2Effect.java
        CHARMOFCOURAGE,
        SIGNET_EFFECT,
        SIGNET_GROUND,
+       PREVENT_BUFF,
        PREVENT_MAGIC,
        TRANSFERDMG,
        CANCEL,
        WARP
    }




L2Character.java
        private boolean _isAfraid                               = false; // Flee in a random direction

+       private boolean _isBuffProtected                        = false;
	private boolean _isConfused                             = false; // Attack anyone randomly

	private boolean _isFakeDeath                            = false; // Fake death
	private boolean _isFlying                               = false; //Is flying Wyvern?
+   public final void setIsBuffProtected(boolean value)
+   {
+      _isBuffProtected = value;
+   }
+
+   public boolean isBuffProtected()
+   {
+      return _isBuffProtected;
+   }
}




Continuous.java
            // Walls and Door should not be buffed
            if (target instanceof L2DoorInstance && (skill.getSkillType() == L2Skill.SkillType.BUFF || skill.getSkillType() == L2Skill.SkillType.HOT))
            	continue;

+           // Anti-Buff Protection prevents you from getting buffs by other players
+	    if (activeChar instanceof L2PlayableInstance && target != activeChar && target.isBuffProtected() && !skill.isHeroSkill()
+           && (skill.getSkillType() == L2Skill.SkillType.BUFF
+           || skill.getSkillType() == L2Skill.SkillType.HEAL_PERCENT
+           || skill.getSkillType() == L2Skill.SkillType.FORCE_BUFF
+           || skill.getSkillType() == L2Skill.SkillType.MANAHEAL_PERCENT
+           || skill.getSkillType() == L2Skill.SkillType.COMBATPOINTHEAL
+           || skill.getSkillType() == L2Skill.SkillType.REFLECT))
+		continue;
EffectDeflectBuff.java
package net.sf.l2j.gameserver.skills.effects;

import net.sf.l2j.gameserver.model.L2Effect;
import net.sf.l2j.gameserver.model.L2Effect.EffectType;
import net.sf.l2j.gameserver.model.L2Skill.SkillType;
import net.sf.l2j.gameserver.network.SystemMessageId;
import net.sf.l2j.gameserver.serverpackets.SystemMessage;
import net.sf.l2j.gameserver.skills.Env;

/**
 * @author Java
 */
public final class EffectDeflectBuff extends L2Effect
{
	/**
	 * @param env
	 * @param template
	 */
	public EffectDeflectBuff(Env env, EffectTemplate template)
	{
		super(env, template);
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see net.sf.l2j.gameserver.model.L2Effect#getEffectType()
	 */
	@Override
	public EffectType getEffectType()
	{
		return EffectType.PREVENT_BUFF;
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see net.sf.l2j.gameserver.model.L2Effect#onActionTime()
	 */
	@Override
	public boolean onActionTime()
	{
		// Only cont skills shouldn't end
		if(getSkill().getSkillType() != SkillType.CONT)
			return false;

		double manaDam = calc();

		if(manaDam > getEffected().getCurrentMp())
		{
			SystemMessage sm = new SystemMessage(SystemMessageId.SKILL_REMOVED_DUE_LACK_MP);
			getEffected().sendPacket(sm);
			return false;
		}

		getEffected().reduceCurrentMp(manaDam);
		return true;
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see net.sf.l2j.gameserver.model.L2Effect#onStart()
	 */
	@Override
	public void onStart()
	{
		getEffected().setIsBuffProtected(true);
		return;
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see net.sf.l2j.gameserver.model.L2Effect#onExit()
	 */
	@Override
	public void onExit()
	{
		getEffected().setIsBuffProtected(false);
	}
}
And this is how the skill should be in DP:
<skill id="add the skill id here" levels="1" name="AntiBuff-Shield">
  <set name="target" val="TARGET_SELF"/>
  <set name="skillType" val="CONT"/>
  <set name="operateType" val="OP_TOGGLE"/>
  <set name="castRange" val="-1"/>
  <set name="effectRange" val="-1"/>
  <for>
    <effect count="0x7fffffff" name="DeflectBuff" time="3" val="0"/>
  </for>
</skill>