He's offering her his sword, meaning his...um, it's a metaphor.

I had been looking for this one for a bit, and I picked it up with a ton of books last week: from 1994, Legionnaires Annual #1, "Castles in the Air" Written by Mark Waid and Ty Templeton, pencils by Paul Pelletier and Jeff Moy, inks by Mark Farmer, John Lowe, Wade von Grawbadger, and Ron Boyd.

1994 was the Elseworlds-themed annuals for DC, and while we've seen way more of the Legends of the Dead Earth ones, we've seen a Batman one, a Robin one...and that's it? Huh. This issue puts an Arthurian spin on the Legion, opening with R.J. Brande and his new recruit, Rokk Krinn, mining nth metal from the ruined planet Thanagar. (Traditionally, Legion flight rings were made with an anti-gravity metal invented by Mon-El; I don't know if this is the first time it and nth metal were connected.) The Dark Circle had been destroying or enslaving worlds across the universe; and Brande had gathered numerous powered kids to join the Legion, and defend the space station Avalon. Today should be a day of celebration there, as Rokk Krinn was finally marrying Imra Ardeen--that's Cosmic Boy and Saturn Girl--but the wedding is interrupted by not one by two lightning-powered intruders: the assassin Mekt Ranzz, who is stopped by his brother, Garth. Mekt escapes, and Garth gives a solid wall of text speech, about how he should've been a Legionnaire instead of trying to hunt down his brother. Imra checks him out mentally, and he clears, but she seems to see something else.

The other Legionnaires find a snake in their midst, who had let Mekt in: perennial Legion traitor Hart Druiter, Nemesis Kid. For his crimes, he is executed by Alchemist/Element Lad; establishing that this Legion didn't have a "no killing" rule, but were pretty bound by their other laws. Hart's dying speech claims nothing can stop the Dark Circle, not even the Miracle Machine: while some of the team believed in it, Rokk did not, dismissing the reality-bending device as a wishful fantasy. As time goes by, Brande passes away, and leadership weighed heavily on Rokk; who wishes his wife was a little more supportive and didn't spend so much time in "virtual space," where she was having a virtual affair, with her true "dearheart" Garth. But, after sabotage damages the station (and, in passing, kills Brainiac 5, Invisible Kid, and Polar Boy) a small band of Legionnaires begin a quest for the Miracle Machine. They start with Queen Projectra, who uses magic to find it, but the trail leads to Mordru, who's so evil it seemingly breaks her.

Meanwhile, on monitor duty, Imra investigates a door alarm, and finds Garth seemingly beaten by Mekt. In fact, Mekt had been there, to try to convince him to join the Dark Circle: Garth refuses, but also won't let Imra gun Mekt down, either. That would probably look bad enough, but when the two are caught together, it's blatantly obvious to everyone, making them doubly guilty in the eyes of Alchemist. Imra pushes Garth to escape, and is later sentenced to death. Ultra Boy and his band refuse to watch that, going off on their quest. They journey to Sorcerers' World, where they are quickly captured by Mordru.

Before Alchemist can pass sentence on Imra, Garth swoops in to rescue her, much to Rokk's relief. But, that distraction was exactly what the Dark Circle needed to invade Avalon. Back on Sorcerers' World, Mordru is mildly taken aback, when the Legionnaires tell him they were searching for the Miracle Machine: Mordru had destroyed that himself, to keep it out of the hands of the Dark Circle. The heroes feel kind of dumb then, like their quest was a waste, and Rokk had been right all along and unity had been the answer. On Avalon, Mekt fights Rokk, but also offers him a spot in the Dark Circle: he'd had the stones enough to sentence his wife to death, he might have been hard enough for them. Rokk refuses, but is mortally wounded, as Mekt takes his flight ring, before Imra stabs him in the back. Mordru returns the other Legionnaires to Avalon; not out of kindness, but because he also hated the Dark Circle. The team rallies, and the Circle's troops are driven off. Rokk dies, but he's happy that his dream had been fulfilled and his friends would be happy together; and Imra and Garth lead Avalon, and Earth, and a new United Planets, into the future. 

I have, at best, a passing acquaintance with Arthurian lore--probably mostly gathered from repeated viewings of Excalibur. Still, the Legion slots into those roles pretty well!