How do I stun lock bosses?

[Lyndonn]

Hi everyone I would like to know if there is a certain amount of damage you should be doing specifically for bosses like dragonfly for example to be stunned? Like do I need about 200 damage/sec or something? Idk the formula for it sadly 

[HowlVoid]

Straight from the wiki:

When fought, she will get stunned for ten seconds if she takes more than 1250 damage within a five-second period. While stunned, if she takes 2500 damage, she will drop Scales. Afterwards, She cannot be stunned for another 60 seconds, and requires an extra 250 damage to be stunned again (this stacks each time). However, subsequent stuns cannot drop extra Scales, but causing the Dragonfly to re-spawn (by leaving the arena or killing her) will reset all of her stats and allow for additional Scales to drop again. This can be easily achieved by dropping two piles of Gunpowder, one of 7 and one of 13, close to each other, then freezing or putting the Dragonfly to sleep next to them and lighting the stack of 7. The stack of 13 will smolder and trigger the Scales to drop.

 

The wiki is a good place to start when ever I need info. Not everything in the wiki is always correct though and some hidden obscure stuff (like hidden mechanics) can be tricky to find. Dragonfly is the only boss that can be stunned as far as Im aware though.

[Cheggf]

No bosses can be stunlocked. Dragonfly's stun mechanic requires about 250 + 50 * timesstunned DPS to trigger.