This flail is effective in damaging and killing the vyrewatch because, despite their sufficient mind-reading ability to predict attacks and avoid damage, the flail is incredibly unpredictable and random. The sickle head further increases the unpredictability of the weapon. Thus, attackers do not hit the Vyrewatch in the intended way, rendering their mind-reading useless.[2]
The flail retains the ability to cast Bloom from the silver sickle (b). This versatility lets a player kill ghasts, vampyre juvinates and vyrewatch with a single weapon.
A player performs the Ivandis flail's special attack, Retainer.
The Ivandis flail has a special attack, Retainer, which traps a vampyre juvenile or juvinate that has less than 50% hitpoints remaining, preventing it from retaliating for 30 seconds. This consumes 10% of the player's special attack energy.
Even if the attack fails to activate, stating either This spell can only be used on vampyre juveniles or vampyre juvinates. or This spell only works against vampyres with less than half of their health remaining., it will still incur the normal attack delay, so take care not to accidentally use it in those circumstances.
Treasure Trails
The Ivandis flail is the item Falo requires players to show him when he sings about: Vampyres are agile opponents, damaged best with a weapon of many components. Alternatively, a rod of Ivandis, blisterwood flail, or hallowed flail can be used.
Despite only having a Crush attack style available as a melee weapon, the flail also has Stab and Slash bonuses.
The Ivandis flail inherits the 0.001kg weight of the rod of Ivandis, even though the chain (3.628kg) and sickle (1.587kg) used to create it have a combined weight of over 5 kg.
References
^Jagex. Mod Ed's Twitter account. 8 June 2020. Archived from the original on 8 June 2020. Mod Ed: "25% bonus damage (compared to 20% for the Ivandis Flail)"
^Flaygian Screwte. "Flaygian's notes". Old School RuneScape. "The more powerful vampyres apparently possess the ability to predict and dodge any attack. This seems to come from a combination of their fast reaction time along with a limited mind reading ability. To overcome this, we will need to create a weapon that attacks in unpredictable ways. If the vampyres don't know what the next attack is, they won't be able to avoid it. From my research, it seems that the weapon we will need is a flail. Flails are said to be very unpredictable which should make them perfect to use against vampyres."