|Like most armored units, due to her lack of movement, Effie is often picked off or damaged for free fairly easily by ranged enemies while trying to approach her target. On top of that, with a Dancer or positioning skills on the other team, these ranged units can essentially move out of Effie's range and kite her until she dies. Thus, this build takes and revolves around IVs to deal with ranged units. Although not an extreme player phase powerhouse like Brave Effie, this build is still extremely potent due to her already high base Atk. For many ranged units who cannot one-shot Effie or lack the Defense to take a hit, this build shuts these units down. Thanks to Effie's already-high base Atk, tankiness and Wary Fighter, this build still poses a threat to melee units as well, making her a more rounded unit.
For her IVs, to start -Spd is her bane of choice. Not only is this because her Spd is already abysmally low, but because with Wary Fighter, she doesn't need to worry about her Spd being even lower. +Atk is taken as her boon to increase the damage Effie can dish out. Other boons are acceptable to increase her tankiness.
Distant Counter is taken as her weapon of choice. Deft Harpoon+ provides an overall stat boost for Effie's first engagement. However, this weapon is not only an expensive investment but was an exclusive weapon limited to the Ylissean Summer (Focus) and no longer available. Close Def 3 is also a strong alternative that also has high Mt and decreases her special cooldown by 1. This means she run Guard 3 at the same charge cooldown as a regular Moonbow with much greater damage thanks to Effie's high Def. Alternatively, Effie's default weapon Def Ploy 3 can be used instead if neither option is available.
Defensively, the build keeps Effie's default B-slot passive Atk Ploy 3 to prevent other units from doubling Effie. This is what allows Effie to successfully survive most encounters despite her low Spd. Without it, she will lose several match ups against speedier units such as mages.
Quick Riposte 3 is chosen as her Assist of choice due to armored units appreciating the extra movement. Close Def 3 can also be taken as well. Swap is typically seen on tankier units. For example, one common scenario is using Swap on an ally who is in range of the enemy. Unlike other skills like Reposition which will keep both heroes out of range, Swap will leave one unit in range. Effie is fantastic at taking hits, thus Swap is a potential Assist skill that can be taken as well.
For her special, Very high investment is selected due to its quick charge time and extra damage, but as mentioned before, she can opt for 3-charge specials if running Slaying Lance+ such as '"`UNIQ--item-417--QINU`"' or '"`UNIQ--item-420--QINU`"'.
For her C passive, Slaying Lance+ works well on Effie due to her high HP, and allows her to reverse the buffs prevalent on common themed teams (Cavalry, Flying Unit, Armored). This also includes teams that revolve around a -blade tome mage and buffs. Since a green mage with Gronnblade+ (eg. Reposition) has the potential to one-shot Effie, using Panic Ploy to reverse these buffs means Effie has the chance to not only survive a -blade attack, but also potentially kill the mage on the counter.
Otherwise, her C-slot is left open for whatever else a team may need such as Hone Buffs, Threaten / Other Ploy Debuffs, etc.
Her Seal is Glimmer, which helps mitigate the damage she takes from a range. Alternatively, she could use Iceberg, which would free up her C skill slot for another armor buff.