<p>Unfortunately, you can't if you don't have the right number, i.e. 250. I killed <strong>Yielotax</strong> <img alt="" src="https://vignette.wikia.nocookie.net/tibia/images/6/63/Yielothax.gif/revision/latest?cb=20110701165104&path-prefix=en" style="height:64px; width:64px">every day, and I know how it works, if you kill only 200 and someone will kill a boss <strong>Raging Mage</strong><img alt="" src="https://vignette.wikia.nocookie.net/tibia/images/9/90/Raging_Mage.gif/revision/latest?cb=20110806185021&path-prefix=en" style="height:64px; width:64px">, unfortunately, but everything will reset. If reset and you must kill 250 again. If you kill 250 pieces and you fail to kill the <strong>Raging Mage</strong> <img alt="" src="https://vignette.wikia.nocookie.net/tibia/images/9/90/Raging_Mage.gif/revision/latest?cb=20110806185021&path-prefix=en" style="height:64px; width:64px">, the next day you have the option to kill and you don't have to repeat killing 250.</p>