A Beguiler is basically a cipher who can cast without generating focus with weapons. Since his Deception powers generate a lot of focus with Draining Whip AND powers cast from stealth count as sneak attacks he can start an encounter with Phantom Foes or Eyestrike or Secret Horrors and fill up his focus right away. Then just keep on casting whatever powers (shred for example) and refill focus with an occasional deception spell. Preferably one that helps you land the next shred spells.
A Psion is also able to be played like a pure caster - but I hate that his focus generation stops when he gets even grazed. Beguiler is kind of the better Psion in my opinion.
A single class Beguiler gets access to all the nice passives in the cipher ability tree - that seem to have been made with Beguiler in mind. Shared Nightmare + Amplified Wave after casting Phantom Foes + Complete Self + Soul's Echo + Empty Soul is just awesome. Huge AoE, lots of crits for will spells - wich will grant you +5 focus ON TOP of the focus you get anyway with Deception spells. It's great. With Time Parasite you can just spam powers so quickly. And besides all that you can still deal decent weapon damage (for a pure caster) if you wish.
Not to speak of the huge impact that all mind control powers have on the gameplay. It's like removing an enemy and summoning a creature at the same time.
Edited by Boeroer, 05 April 2019 - 08:16 AM.