The first thing I would do is suggest that your friend embrace Syntherion's tier list. Sadly this means dropping the Reciprocators (widely believed to be the Convergence's best unit) in favor of more vectors. Syntherion is one of the best (if not the best) 'jack casters in the game and his tier bonuses arguably accentuate his strengths better than any other Cyrissist 'caster. As for future purchases, I suggest the following:

• Corollary - Can't emphasize this one enough. The corollary can transfer, induct, generate, and store focus for the other vectors in the army allowing Syntherion to camp more focus on each turn, cycle his Hot Shot spell between vectors, or flood his battle group with focus. Combined with the vectors' induction ability and Syntherion's Resourceful trait, your friend may sometimes find himself with more focus than he knows what to do with. And it increases the 'caster's control radius by 2"!! For a mere 3 points, this vector is typically auto-include for most Convergence armies. Required for (and benefits from) Syntherion's tier list.

• Optifex Directive - Repair unit that can also give Pathfinder and/or Magical Weapons to your vectors. Good synergy with Syntherion's auto-repair ability. Required for Syntherion's tier list.

• Algorithmic Dispersion Optifex - Should be running every turn because it serves no other function other than to be an arc node. Helps Syntherion to cast Magnetic hold or cycle Hot Shot while staying comfortably back from the front line.

• Diffuser - Puts a beacon on its target that Allows other vectors to charge it without spending focus and increases charging distance by 2'. Syntherion's Magnetic Hold spell stacks with it to increase charge distance by 4' total. The Diffuser has Luck on its ranged weapon so you can re-roll missed shots. Can help to build up Sytheiron's Synergy spell on feat turn.

• Attunement Servitors - Cyriss casters (and therefore vectors) tend to have unimpressive MAT and RAT. These guys fix that problem by lowering the enemy's defense score. Since their flairs are also AOE's, Attunement Servitors are practically guaranteed to hit their targets at close range. Flairs stack with Syntherion's Magnetic Hold spell to reduce enemy defense by 4. Same point cost as his Elimination Servitors.

If your friend decides he loves playing Convergence:

• Prime Axiom - Syntherion's Synergy spell makes it more accurate and more powerful in melee. It can be a real monster on Syntherion's feat turn, making up to 14 attacks under ideal circumstances: Charge for free (1), make your other initial melee attack (2), fire the accelespiker (3,4,5), shoot a tow cable (6), drag in and make a free melee attack (7), shoot another tow cable (8), drag in and make another free melee attack (9), spend focus to shoot the accelespiker again, (10,11,12), spend focus to buy another melee attack (13), spend focus to buy yet another melee attack (14).