Good day,
My current build set is sw3-barb3-dop3. I am planning to buy two centaurus cards (seeing that I have enough money). I do wonder whether +10 aoe ratio is enough on mobbing so I could insert possibly frost lord or prison cutter.
Thank you
Centaurus Card
[Card Equip Effect] AoE ratio +[★/5]
★=10 10/5=2 
pardon me if i misunderstand but i believe you want to imply that he said that centaur cards gives 10 aoe atk ratio? because by what he wrote of course he knows that is not true; he never said that centaur gave +10 aoe ratio, he asked if +10 aoe ratio is enough to play!.
he should have right now 6 aoe atk ratio and by his msg, once he buys two centaur it would reach 10 and thus came the question if this would be enough for him or not!.
if it so, then “+” is excess.
for me the + would be how it work there is nothing wrong with it: the total aoe ratio of the character is added on the base aoe ratio of the skill; so the total value of a aoe atk of a character can be seen/or show as +10, since it would increase +10 aoe atk ratio in every skill!
again i do not see anything wrong with it; since he never stated that the + would refer to the centaur, he have even use “.” to separate the sentences.
I didn’t say it’s wrong, i mean it confuses.
…
oh wait, i got scammed there. I really thought it would give +5 aoe ratio. Considering I have enough money for 3 *10 centaurus card. Is it worth it to get the +6 aoe ratio?
nope, it doesnt worthed