Aptissian

Phonotactics
Aptissian phonotactics strongly favor syllables with few consonants.Syllables are of the type (C)(C)(L/S)V(C). Consonant clusters in the onset are mostly limited to combinations of voiceless fricatives and /t/ or /s/ and /p k/. All plosives can be followed by /r/. All consonants can be followed by a semivowel /j w/.

Stress & Tone
In Aptissian, stress is assigned according to the so called 2-mora rule. The rule states that the stress falls onto the syllable which contains the second to last mora in a word. Stress is therefore dependent on syllable weight. Aptissian distinguishes light and heavy syllables, lasting 1 mora or 2 morae, respectively. A syllable is considered heavy if it contains any of these features: Since all syllables have at least 1 mora, stress can only fall on either the penultimate or ultimate syllable. If the penultimate is stressed, it recieves a low tone. If the ultimate is stressed, it recieves a high tone.
 * A long vowel
 * A diphthong starting with a long vowel
 * A nasal in the coda
 * A part of a geminated consonant in the coda

There exists a class of words called "moraic clitics". These are monosyllabic words that can only appear attached to other words. Regardless of there syllable weight, they add a mora to the ending of a word without counting as a syllable of the word - therefore the stress will always fall on the syllable preceding the clitic and the tone will always be high.

Orthography

 * Long vowels were traditionally marked with an apex - nowadays though, most people use the acute accent since most technologies do not support the apex sign
 * Diphthongs are written as the combination of their sounds - if, instead of a diphthong, a hiatus occurs, the Ι/Υ is marked with a trema if it is a short vowel or with an acute accent if it is a long vowel
 * If Ι/Υ could represent a /j/ or /w/, they do - the vowels have to be marked either by trema or by an acute accent
 * The phoneme /ŋ/ is written as ΓΓ/γγ
 * The phoneme /h/ is written as a spiritus asper above the following vowel (Examples: ἁ ἑ ἡ ἱ ὁ ὑ ὡ)