I'm a light armor magplar who is very at home in an openworld build optimized for No-CP land, but like any ole' build it can be used for dueling with favorable results, even with CP. A magplar is a predominantly (even almost exclusively) a melee fighter; I could not find a single magplar build online that centered on a destruction staff for damage. Because of the magplar's reliance on melee (we can blame Puncturing Sweeps for this--love that skill), they are very susceptible to roots, for which there is no period of immunity against. I have found that, against a very good magicka nightblade, a light armor magplar has little to no chance to win--which I believe this is in no small part due to the roots and other CC.
I asked these magblades when the last time they lost a duel to a light armor magplar, hoping to then ask how exactly they lost so I could improve based on that information. To my surprise, none of them could ever recall the last time they lost to a light armor magplar. At best, one nightblade could only remember a loss to a heavy armor magplar. I then went to a number of really good light armor magplars and they echoed my experiences of not being able to defeat a really good magblade.
I started thinking back to my duels against other classes with skilled players that represented their class very well. Magsorcs have always been difficult, often times I could only wait for a shield to lapse and jump in with a CC, but usually very miserable fights. MDKs are worse because they keep you rooted and move to your backside. Mist forming out buys you a few seconds at best before you're back in the "cage." The light armor magplar seems to be the worst off in duels involving other magicka classes and a lack of burst options are probably the culprit.
So what are your experiences involving light armor magplars? How do you deal with a light armor magplar? How do you lose to one? How are your experiences vs the other classes as a light armor magplar? (For all intents and purposes, a heal-spec cheeseplar is not a real dueling magplar)
The generally amicable yet sporadically salty magplar that may or may not have 1vXed you in Sotha Sil. Who knows?