Bool - Boolean structure type that represents a Boolean value, which can be either true or false.
Void - Is a reference type of data type and used to specify the return type of a method in C#.
If you don't understand the above, start here: https://www.youtube.com/watch?v=GhQdlIFylQ8
I do not know what spell 49936 is as it says it has been removed on Wowhead. Remove the SpellManager..... line from the if condition since it's not a boolean (bool).
instead of DnD.Launch(); use ClickOnTerrain.Spell(43265, ObjectManager.Target.Position, false, false);
if you want to check if the Target is on your DnD, then do something like this in the if condition (bool): ObjectManager.Target.BuffCastedByAll(DnD.Name).Contains(ObjectManager.Me.Guid)
if you want to cast it on the Target if it isn't on your DnD then add a "!" to it. The "!" is a negation. AKA the opposite (bool): !ObjectManager.Target.BuffCastedByAll(DnD.Name).Contains(ObjectManager.Me.Guid)
I forget if the debuff is the same as the spell. If it is, the last few lines will work.