EntityTMarine entityMarine = new EntityTMarine(world);

ModLoader.RegisterEntityID(EntityTMarine.class, "Marine", ModLoader.getUniqueEntityId());
ModLoader.AddSpawn("Marine", 1000, EnumCreatureType.creature);

entityMarine.setPathToEntity(world.getEntityPathToXYZ(entityMarine, mc.objectMouseOver.blockX, mc.objectMouseOver.blockY, mc.objectMouseOver.blockZ+1, 10));