Magus attack and concentration

	A	B	C	D	E	F	G	H
1
2	Spell Level	0	1	2	3	4	5	6
3	Defensive Casting Check	15	17	19	21	23	25	27
4
5
6
7	Int	20
8	Caster Level	8
9	Magus Level	8
10	Base Roll	13
11
12
13	Additional Penalty	0	1	2	3	4	5
14	Concentration Bonus	2	3	4	5	6	7
15	Modified Roll	15	16	17	18	19	20
16
17	Penalty Taken?	2
18	Spell Level	0	1	2	3	4	5	6
19	Roll Required?	-2	0	2	4	6	8	10
20