How strong are the Pleiades maids in overlord? Narberal Gamma uses twin dragon lightning which I believe is approximately 7th tier magic. Yuri Alpha uses weather modification magic which is 6+ tier magic. I know they're weaker than the floor guardians, but did the show/Manga/LN go into just how strong they are? I got the impression that each one could have beaten Evileye on their own, but the only reason Entoma didn't was because of vermin bane.
This is what I found elsewhere:


  The light novels have the stats, but in order of ranking:
  
  Narbarel Gamma (63) was chosen to accompany Momonga because she was
  the best combatant of the group and the one that can interact best
  with humans without being found out.
  
  Lupusregina Beta (59) is just below her and is also allowed to fight
  autonomously and like Narbarel, also human-like.
  
  Solution Epsilon (57) follows that order as well, being one of the
  field pleiades though in her case, she's not very good for missions
  that require excessive contact.
  
  Yuri Alpha (52) is the leader in terms of order, but is significantly
  weaker than the first half of the Pleiades. However, she is still
  massively overpowered by NW standards though it still takes her and CZ
  Delta to keep Evileye on edge. Like the Pleiades weaker than her, she
  is not a field agent and is generally relegated to the tomb.
  
  Entoma (51) is also comparable, but unlike Yuri, she is freakish up
  close and is ill-suited for field activity especially since she draws
  attention to herself.
  
  CZ Delta (46) is the weakest and is actually weaker than some of the
  strongest new worlders (shown in the latest novel where she needed
  prep time in order to actually be effective in comparison to the
  steamroller that is Narbarel). She is generally ill-suited for field
  activity since her low level makes her a poor choice to work
  autonomously. However, she is a sniper, so she generally won't be
  working autonomously on the Nazarick team to begin with.
  
  Aureole Omega (???) is likely the strongest and is generally a
  function guardian and has yet to appear. However, she is highly likely
  to be a 100th level NPC due to the insinuation of her role.


Evileye is about level 50 and would have lost to Entoma if she didn't have vermin bane, potions, and assistance.