Assertion: doom | /r/CapableOf | swear deadly vengeance
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text: In August 1981, Doom also made an appearance in Iron Man when the two traveled to Camelot, where Stark thwarted Doom 's attempt to solicit the aide of Morgan le Fay into defeating King Arthur's forces with an army of revived warriors who were slain by the sword Excalibur; Doom swore deadly vengeance for that interference, which stranded him in the past - this vengeance had to be indefinitely delayed in the interest of returning to the present day.