Arena Ranks Guide for Fire Emblem Heroes.

Tier Arena Rank
a Tier 1 7th Platoon Trainee
b Tier 2 Whitewing
c Tier 3 Dragoon
d Tier 4 Sable Knight
e Tier 5 Lanceritter
f Tier 6 Grünritter
g Tier 7 Weissritter
h Tier 8 Archer General
i Tier 9 Mage General
j Tier 10 Knight General
k Tier 11 Great General
l Tier 12 Third Wyvern General
m Tier 13 Eight-Generals Rank
n Tier 14 Imperial General
o Tier 15 Four-Riders Rank
p Tier 16 Holy Guard
q Tier 17 12-Deadlords Rank
r Tier 18 Hoshidan Noble
s Tier 19 Nohrian Noble
t Tier 20 First-Dragons Rank