Talk:Summer 2017 Event/@comment-25283939-20170903143350/@comment-26082284-20170903152628

One green barrel is enough to upgrade dmg modifier from 80% to 100%. That's not enormous difference, but it's noticeable. On the minus side you have one yasen fighter less. In my case it was worth it, as without Hayasui my LD would probably end with boss at +50hp, instead of -50hp. But I can see that for some TTKs some damage dealing flagship might make up for difference in damage modifier.

Second green barrel doesn't affect damage (it's already maxed up), only increases evasion to nominal. So decision whether to use it is up to you. Imho, if you have stockpiled lots of green barrels (as I did from quests) you might splurge - after all, when use barrels if not now? But it's definitely not going to make substantial difference and some night combat equip or even combat rations might be better use of second slot.