public static MaplePacket environmentChange(String env, int mode) {
        MaplePacketLittleEndianWriter mplew = new MaplePacketLittleEndianWriter();
        mplew.writeShort(SendPacketOpcode.BOSS_ENV);
        mplew.write(mode);
        mplew.writeMapleAsciiString(env);
        return mplew.getPacket();
    }