Are you always making a concentration check every time you use the Magus' Spells Combat ability and if so what is the DC of the check?


1 Answer 1


A concentration check isn't required, but you probably should be casting defensively if threatened!

When using spell combat you don't always have to make the concentration check:

If [a magus] 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.

Casting defensively is what triggers the concentration check… but it also protects you from attacks of opportunity! It's not that hard to succeed on the check: You roll d20 + caster level + Int modifier for a magus + any miscellaneous bonuses against DC 15 + double the spell's level. That means, at level 5, you have about a +9 on the check, assuming you didn't grab any traits for concentration. The sorcerer in my game consistently gets results of 30 or more at level 7 with a nearly +20 modifier (+7 from caster level, +6 from Charisma for a sorcerer, and +4 on the check from the feat Combat Casting).

If you don't cast defensively, you leave yourself open to attacks of opportunity, and, if enemies hit, the concentration check is more difficult the harder the enemy hits: DC 10 + damage dealt + the spell's level. (And you'll take damage… who wants that?)

  • 2
    \$\begingroup\$ There is a balance between high AC and high concentration DC that sometimes makes it easier to risk taking an attack. \$\endgroup\$
    – ShadowKras
    Sep 17, 2017 at 13:26
  • 1
    \$\begingroup\$ I dunno. From my experience, assuming you have decent spellcasting stat, and a background trait/feat for concentration I feel like the concentration check is always safer and easier to your favor. You have a DC 22 for a 6th level spell. (The highest a magus can cast) at lv 10 they are at a DC 18 for their 4th level spell. and they already have a ~+15 w.o traits or feats. Having Combat Casting makes it impossible to fail. When the magus gets 5th level they are rolling +18 against a DC 20 w.o spell combat. Even if they have super high ac, there is a 5% chance the enemy will roll a 20 and crit. \$\endgroup\$
    – Erudaki
    Sep 17, 2017 at 19:29

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