Long syllable = CVCC, CVVC and so on = S
Short syllable = CVC = H
Long mora = CV = M
Short mora = C = L
Here's the accent table of Arka.
Rule 1: 1) is stronger than 5)
1) accent on the 2nd S
2) accent on the 2nd or 3rd H
3) accent on the 3rd M
4) accent on the 2nd M
5) accent on the 4th mora
HLM can be SM, but it can't be HS.
MLH can't be MS. MLM can't be MH.
MML can be MH.
HMH and MMH can't be accented by rule 1. So there is rule 2.
X is a strong syllable. Y is a weak syllable. The vowel "ai" is X while "ia" is Y, for example.
1) HMH: har/dI/gan: M is accented like "armalet" and "artales."
2) HX: har/dAin: X is strong, so X is accented.
3) HY: hAr/dian: Y is weak, so Y isn't accented. The former syllable is accented instead.
Like Amalis, Atolas, agEit, kAmian, rIdian.
1) MMH: A/ma/lis, A/to/las: M is accented.
2) MX: a/gEit: X is accented like "elEin."
3) MY: kA/mian, rI/dian: Y isn't accented. The former syllable is accented instead.
amai isn't MX.
aria isn't MY. It's MMM, not MMH.
The Table of Rule 2
These rules are not valid for loan words. e.g. flanflEr (summur in Lutia). You can check exceptions by consulting the dictionary.