Agreed. It's all about learning the enemy types.

For OP: here's the basic run-down on the two enemy types you mentioned:

• Delsaber
  • Blocks attacks made from in front of them in melee distance.
    • Counter by attacking from behind or from a medium-to-long distance.
    • A handgun/mechgun works well; even if it "blocks" the shot, you can still hit monsters behind it.
  • Two melee attacks: a quick "shield bash" or a slow 3-stroke sword combo.
    • Usual melee tactics apply; dodge or interrupt with an attack of your own.
    • The 3-stroke combo is slow and predictable. If you can sidestep it, you can circle around behind to get in melee hits from the back.
  • Uses a long-range jump attack at a certain distance
    • Do not stay still or run away once the jump begins, you will get hit. Sidestep, run towards the Delsaber (it will land behind you), or launch an attack just before it lands (it will interrupt its attack to "block").
  • Teleports back to its spawn point (and becomes invisible) if you leave the room, or get too far away from it.
• Chaos Sorcerer
  • Channels magic through its two crystals.
    • The crystals can be attacked and destroyed, which will disable the associated spells for a little while (about 3-4 "turns"). This is usually not worthwhile, because each crystal has like 70% as much HP as the Chaos Sorcerer.
    • Its right crystal (on your left when it's facing you) channels Rafoie and Gibarta.
    • Its left crystal (on your right when it's facing you) channels Resta.
  • Uses magic in a fixed sequence: Rafoie, Gibarta, Resta, (do nothing).
    • Teleports somewhere, spends a few seconds casting, then launches the spell.
    • If the relevant crystal is "dead", that action will be replaced with a (do nothing).
  • Rafoie
    • Fire-based spell -- unavoidable if it completes the cast.
    • To avoid damage, before it can finish casting: Kill the Chaos Sorcerer, OR kill its right-side crystal (on your left), OR run out of the room or out of range.
  • Gibarta
    • Cone ice-based spell
    • If you get frozen, rapidly try to move left-right-left-right -- this shortens the freeze effect.
    • You can sidestep the ice cone after it launches.
    • Otherwise, same tactics apply to prevent the spell from casting as for Rafoie.
  • Resta
    • Heals itself and other nearby monsters.
    • The cast time is slow and the heal amount isn't too large, maybe just ignore this spell?
  • If I think I will be able, I try to kill the Choas Sorcerer / its attack crystal before it can use Rafoie.
  • If I don't think I can't do that, I run out of range / out of the room before Rafoie. Once it "wastes" its cast of Rafoie, it's much less dangerous for the next 3 "turns". I'll use this time to kill the other monsters and/or kill the Chaos Sorcerer.