Ancient X Weakness

"Is... "Isaac Logical" here?" The man asked.
"Well, it's his shop, so he'd better be." Aquadilus grunted before turning around and yelling into the back of the building. "Isaac, you got a guy who wants to talk to you!"
A loud, annoyed groan came from the back room.
"How important is he?!" Isaac yelled back.
"Why does that matter?!"
"I need to know if I can blow him off or not!"
"Well, I don't know who he is, so your guess is as good as mine!"
"My name is Osirimes." The man clarified.
"He says his name is Osirimes!" Aquadilus yelled. "That means anything to you?!"
There a brief period of marked silence before Isaac suddenly slammed open the door to the front of the store and froze upon seeing who Aquadilus was talking to.
"Holy shit, it really is you."
"Apparently it does." Aquadilus grunted.
"Wha- he's Dethrogue, you scaly jackass!" Isaac snapped.
"Oh, right, that guy." Aquadilus hmmed.
"How could you forget about that?!"
"I never actually saw the guy." Aquadilus tsked. "All I had to go on was what you told me."
"Oh, for the love of-" Isaac pinched the bridge of his nose. "You know what, whatever, point taken, not the most important thing in the room right now. Speaking of which," he jabbed an accusatory finger at Osirimes, "how are you alive?!"
"You seem more shocked than I assumed you would be given your own propensity for reviving from the dead." Osirimes commented.
"The difference is that I have magic sci-fi bullshit watch that keeps reviving me." Isaac pointed at the SpecTrix. "And unless you somehow hid an Omnitrix up your ass, you don't!"
"Truth be told, I don't know how I returned to life myself." Osirimes said. "I was revived by someone else, and they refused to disclose their methodology."
"Well now, ain't that convenient?" Isaac scowled.
"Actually, it's proved to be rather inconvenient thus far."
Isaac glared at him silently for a few moments before raising his arm and jabbing a thumb into the back room.
"We'll talk in there." He stated. "I don't need any customers walking in on a mass murderer standing at my front desk."
----
Isaac brought Osirimes into the back room and closed the door behind them. Moranna was in there as usual, and she raised a questioning eyebrow at Isaac as he directed Osirimes to sit down across the room from them.
"Remember Dethrogue?" Isaac grumbled, receiving an affirmative nod from Moranna. "Yeah, him."
"Really?" Mornnanna looked over at Osirimes. "Not quite as impressive without the armor."
"I do have a new set of armor, but I assumed a weapon capable of wiping cites off the map was not appropriate to bring to a one-on-one conversation."