Hi, blizzard. Can you please change plague runeword a bit?
instead of “casts lower resist on struck” . Can you please change it to "on striking"
and please change casts poison nova “on struck”, not striking. Rather than using act 2 merc, This would be much better option and would be giving a chance to use a act 3 merc instead of act 2 merc.
Plus this can be a viable option to use plague runeword on act 3 merc instead of infinity (act2 merc).
Hope you take this into consideration.
Well, the runeword is very specifically named Plague, thematically speaking, having it spread poison when striking makes sense. Having it lower resist when struck is… just to make it not useless 
Besides, I feel like lower resist on striking would probably be too powerful. You would basically have it trigger almost instantly with an A2 merc anyway because their attack speed is off the charts. Statistically, you need 5 strikes to trigger something that has a 20% chance, and that is achieved by an A2 merc in about… half a second. More or less.
However, budget A2 mercs are currently equipped to have Fade trigger with their armour, making them much more capable of dodging. This means the trigger frequency of Lower Resist will suffer as well, and that’s where you have to decide if dodge chance increase is worth the lowered trigger rate of lower resist.
I think switching the two around would mess with the thematic point of the runeword and would simply be unbalanced.
It is, after all, relatively cheap(as compared to Infinity, mind you).
well , the reason why i said like that is, I wanted an alternative option to deal with immunity monsters. As you know, infinity is too expensive and it is extremely hard to come by ber rune.
Well, that’s why it helps you deal with monster immunity. Sometimes you just gotta deal