[1.2.328] Battlemages get their spotlight

Could you (or aarparp if he sees this) provide an accurate translation for this little bit from the description of level 30 Infinity?

4초마다 모든 공격 마법의 피해 10%씩 증가

Every 4 seconds, all magical attack damage is increased 10%. That's what it says. Dunno if that's what it does though. Would be pretty cool in my opinion.