Overlord II
49 Achievements
1,000
35-40h
Industrious Magic
You have achieved 50 kills through overcharging your Evil Presence Spell
10
How to unlock the Industrious Magic achievement in Overlord II - Definitive Guide
Do this 50 times.
You should be able to get in 3 or 4 kills before you're mana (the blue bar in the top left) is gone. To recharge you'll need to retreat to a tower portal or pick up a blue potions dropped by enemies or found by breaking stuff.
Target and enemy using and Hold until they are dead. This is easiest on your destruction playthrough as you can kill the townspeople this way with Netherworld gates close at hand to recharge your mana. (Just make sure not to dominate one by mistake). Alternatively it can be done on any enemy on a domination playthrough. Another option on Domination is to make a second save game, kill 50 townspeople, and then just reload you original save.
Become a destruction based overlord (it makes evil presence stronger when you upgrade it with spell catalysts)
Then as the other guide says go through the game and use the spell A LOT. Given the amount of enemies you will fight, it should unlock in no time. :)
To use this spell be within range of an enemy/villager, lock on to them and hold SQUARE. You get the spell after you open the gate by Nordberg and can not be missed. An easy place to get this is on your Destruction run. When you are killing Nordberg citizens you will get this very quickly and should be able to get this without difficulty. If you still haven't gotten this later in the game you can kill the gnomes at Everlight Facility with this spell.