This was the copied in the Goblin Quest’s Beta, but I have removed that so that it does not confuse anybody.
On Quest Stage 6 and 9 where we have Moonflower this part of his skill makes him very dangerous as if you do not see that this buff is on him, then you are killing your own heroes if you firing some of your heroes in a row.
Luckily dispellers can prevent this even if this buff is on.
I actually brought 4 of them with us to beat level 9 + C2 Quintus to prevent even this buff to be applied + Timestops.
On level 9 this hero is paired with Lionstring, who gives Dodge buffs, so even using dispellers is risky, as on dodge Moonflower will fire this 235% attack to all of your heroes.
So you need to be very careful.
This skill in Starwalker is also dangerous for cleansers as at cleanse it deal 2k+ damage at level 10.