Can an Eldritch Archer Magus use two thrown weapons while using spell combat?
Instead of a light or one-handed melee weapon, an eldritch archer must use a ranged weapon for spell combat. She doesn't need a free hand for ranged spell combat. The eldritch archer cannot accept an attack penalty to gain a bonus on concentration checks to cast a spell defensively.
Ranged Spell Combat (Ex): Instead of a light or one-handed melee weapon, an eldritch archer must use a ranged weapon for spell combat. She doesn’t need a free hand for ranged spell combat. The eldritch archer cannot accept an attack penalty to gain a bonus on concentration checks to cast a spell defensively. This ability modifies spell combat.
Spell Combat (Ex): At 1st level, a magus learns to cast spells and wield his weapons at the same time. This functions much like two-weapon fighting, but the off-hand weapon is a spell that is being cast. To use this ability, the magus must have one hand free (even if the spell being cast does not have somatic components), while wielding a light or one-handed melee weapon in the other hand. As a full-round action, he can make all of his attacks with his melee weapon at a –2 penalty and can also cast any spell from the magus spell list with a casting time of 1 standard action (any attack roll made as part of this spell also takes this penalty). If he casts this spell defensively, he can decide to take an additional penalty on his attack rolls, up to his Intelligence bonus, and add the same amount as a circumstance bonus on his concentration check. If the check fails, the spell is wasted, but the attacks still take the penalty. A magus can choose to cast the spell first or make the weapon attacks first, but if he has more than one attack, he cannot cast the spell between weapon attacks.
Since it Modifies Spell combat it would Probably look something like this if you alter the full text:
Ranged Spell Combat (Ex): At 1st level, a magus learns to cast spells and wield his weapons at the same time. This functions much like two-weapon fighting, but the off-hand weapon is a spell that is being cast. To use this ability, the magus must be wielding a Ranged Weapon. As a full-round action, he can make all of his attacks with his ranged weapon at a –2 penalty and can also cast any spell from the magus spell list with a casting time of 1 standard action (any attack roll made as part of this spell also takes this penalty). A magus can choose to cast the spell first or make the weapon attacks first, but if he has more than one attack, he cannot cast the spell between weapon attacks.
It seems by replacing the text with what the Eldritch Archer modifies, that Ranged Spellstrike still uses your off-hand and thus you cannot TWF with the ability by RAW, since spell combat and TWF both use your off-hand weapon.
But honestly, the image is cool so who cares? :P
Ranged Spell Combat (Ex): At 1st level, a magus learns to cast spells and wield his weapons at the same time. This functions much like two-weapon fighting, but the off-hand weapon is a spell that is being cast. To use this ability, the magus must be wielding a Ranged Weapon. As a full-round action, he can make all of his attacks with his ranged weapon at a –2 penalty and can also cast any spell from the magus spell list with a casting time of 1 standard action (any attack roll made as part of this spell also takes this penalty). A magus can choose to cast the spell first or make the weapon attacks first, but if he has more than one attack, he cannot cast the spell between weapon attacks.
Actually, that is not correct. You must have missed this line
Ranged Spell Combat (Ex): Instead of a light or one-handed melee weapon, an eldritch archer must use a ranged weapon for spell combat. She doesn’t need a free hand for ranged spell combat. The eldritch archer cannot accept an attack penalty to gain a bonus on concentration checks to cast a spell defensively. This ability modifies spell combat.
I'd almost always recommend the Myrmidarch archetype over the Eldritch Archer, especially since they fixed the issue with ranged spellstrike. It gets fighter weapon training ...