I have it in my Scrapper's Fireball and I'd say it's not reliable enough for a good mitigation against your chosen enemies. If surrounded, I usually see 2-4 targets knocked down, most I've seen would be 6 or 7 at a time which, when you consider it would be next to useless on Rikti Drones, I don't think it will be too useful to you and might be better used on a damage proc or additional power enhancement.
That's just from my experience of it though, so I suggest waiting for a few more replies before making a decision.
I am the Blaster, I have filled the role of Tank, Controller and Defender
Sometimes all at once.
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The magnitude of a knockback effect simply determines how far the target will be knocked back, and/or how much knockback protection it can cut through and still have an effect. If a knockback power has a magnitude under .7, then it becomes knockdown instead.
Therefore, the magnitude isn't the important part of the proc, it's the %chance of activation. At 20%, the Ragnarok proc is handy, but not lifechanging. Every time you fire into a crowded group, a couple targets should fall down; nowhere near the entire group, but anyone busy picking themselves up off the ground means that they aren't hitting you. If you put it in something you spam (like my blaster's Fistful of Arrows) then it translate into a noticeable survivability increase but not a very large one.
Bottom line - if you aren't giving up anything else particularly important to squeeze it in, and you are comfortably wealthy enough that you can buy one, then go for it. The only potential problem is that Drones fly and are therefore knockdown-proof, and monkeys that get hit by the proc but not killed outright by the blast may get knocked backwards, since they fly farther from knockback.
Rule number six of an empathy defender is NEVER underestimate a blaster's ability to die. I don't care if he has CM, Fort, both RAs, bubbles (both FF and Sonic), and is fighting next to a Storm defender with hurricane on. If there is a way to die in that situation, the blaster will find it.
ok ty for the info on it, i really dont need it for any survivability, i can farm +4 rikti if i wanted and was just wondering if it would work well enough like a mini footstomp, but it doesnt sound like it will. So i'll opt to skip it. Usually the rikti drones are dead the sec i fire off my BU/Lightning Rod anyways. TY again
So say i slot a [Ragnarok:Chance for knockdown] in my dark obliteration power... btw im farming rikti at +2/8 all the time. Now well is it going to knockdown a mob of 10-15 every 10sec that its up? says its a mag 0.67...is that enough to make it the trouble to slot?