King Kurask is a relatively strong boss battle. For players at the upper end of intermediate or those who have ascended into the category of high-level experts, this boss will pose a fair challenge. However, when compared to some of the bosses within OSRS, King Kurask is a teddy bear. With that in mind, you may be wondering what bosses pose the biggest threat in OSRS. Well, here are the top five strongest bosses in OSRS: Verzik Vitur: June 2018–present TzKal-Zuk: June 2017–7 June 2018 Great Olm: January 2017–1 June 2017 Corporeal Beast: October 2014–5 January 2017 TzTok-Jad: February 2013–16 October 2014 Currently, the monster's powerful beast is Versik Vitur, the Vampyre ruler of Ver Sinhaza. She boasts a tremendous combat level of 1520 and is one of, if not the most brutal challenges that players will face throughout their entire playthrough. So if you happen upon this devastatingly powerful queen, beware.