Title, This Summoners Weapon is pretty good in terms of defensive power, LS is 15% HP/P.DEF, which is pretty good just by the HP side (Using one as a Leader it makes it easy to reach 4000 HP with Maxed units)

• This evolution comes from the Green Spear weapon, its 3* and it just evolve right away to 5* so you dont have to spend extra mats on 4* evolution

• The BB of that weapon gives a P.DEF/M.DEF buff (10-15% i think?) if you reached last chapter without investing a lot in your summoner unit, consider going for this since Blue Crystals are kinda rare to farm

• The Skills you can buy with EP from this weapon are pretty good as well, 1st is 10% HP/M.DEF and the 2nd is 15% HP/M.DEF, it will be probably good skills to use even when using other type of weapons

• One advantage you take from using this weapon as a leader skill is, when you have high HP, Healing items also will heal more hp, since they are % Based

Thats it, correct me in anyway if this post is wrong or something, i'll edit it!

If you dont know where to farm the mats for that evolution, check the link below, its the spreadsheet from ModTeam, it has all the info about the Quest missions BUT also has a Tab that has the name/mission ID that drops each mats (some of them are not updated yet, give them time to add it!)

https://docs.google.com/spreadsheets/d/182wSMYz8FwwpfRu0BiGNbpxmRek0-aeHpBE9qLYlEuo/htmlview?sle=true#gid=1061668250