1.Fate's Decree' Means:
1:Luckily
2:Unfortunately
3:by chance
4:fortunately

2.They were roaming aimlessly
Aimlessly is:
1:verb
2:noun
3:pronoun
4:adverb

3.You should abide by the rules
Abide is:
1:Phrasal verb
2:noun Phrase
3:Objective phrase
4:adverb Phrase