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Officers & Skills (Priority first):

It's 60-65% of the city power

-Officers are very important to your stats, each skill that officer can learn, gives up to 50% extra Damage at maximum level for 1 single skill.
Long range attack skill for 6 officers = 300% long range attack.
Officers skills can give you more than 450% damage boost at max level, but it will need months to reach there.

- Officers are the most important aspect of this game. the better and higher level officers, will decide how strong your city and troops are.
if you have weak stats you will always stay weak.

-Officers to have maximus stats, They need to be 5 stars and Level 55,
you will reach there by killing zombies/ Black market /center exchange / Ruins exploration/ or Purchasing daily special packs.

Director officers( no need to level up but only stars up for ability):
I. Medici : very strong combat ability at star 5(Priority)
( damage 3 targets and make them miss for 2 sec, it activate every 10sec)
Doc Gray : Very strong combat ability at star 5(priority)
( increase damage x1.5 critical hit chance)
note: you can get them from Center exchange everyday 4-5 fragments

Strategy Officers:
-Morgan :Most important officer try to get his level so high. increase the fleet size.
-Saki : Increase fleet size + nation cross abilities

Drillmaster Officers:
Cattie : decrease damage/ increase hospital capacity/ Increase damage vs melee and middle range
-she has very strong ability at 5 stars(priority)
Simon: Big Increase in Damage/ increase hospital capacity/ Reduce damage middle range/ long range
-He has very strong ability at 5 stars (priority)

6 Warfare Officers ( fighting stats % ) Important by order number:
1.Zeus (Combat skill every 8 sec Priority)
2.Tifa (Combat skill every 12 sec Priority)
3.Aoen (good skill)
4.Alexandria
5.Panda Jack
6.Storm Bow
Each of the Officers have 3 slots skills preferred:
- Long range attack 50% max
- Long range expert 25% attack 25% HP max
- Long range HP 50% max

This is a beginners guide I made, but if you're spending money on this game. best way to do it is by having strong officers.
everything else don't matter. If you make your officer strong then you can reach +400% +500% +800% range attack
Most important abilities: I. Medici /Doc Gray/ Cattie/Simon/Zeus/