The two mechanics you mentioned are very different from each other. "Hexed" is a status condition that is also applied in other situations, such as King Zelo's beam, Condensed Sins and Sir Baeloc/Sir Nictros. The Goshnar's Malice mechanic is unique in terms of how it looks and how to avoid it, but there are many other bosses with explosion mechanics such as Gaz'haragoth, Prince Drazzak, Outburst, Lokathmor, Mazzinor, Lady Tenebris and Razzagorn. All of these have explosions that deal high damage but can also be avoided in some way. In other games these are usually called "Doom" mechanics. If that's what you mean I suggest removing the Hex example and focus on that.