Would it be haraam if I killed a spider on the night of Qadr? I have no idea about this but i become very scared when i see it so killed it ...Please tell me for this reason my dua and other things i do will be lose or not please help me
It is not permitted to kill any life that Allah has made scared, whether it is on the night of Qadr or not.
Say: "Come I will rehearse what Allah hath (really) prohibited you from": join not anything with Him; Be good to your parents: kill not your children on a plea of want;― provide sustenance for you and for them;― come not nigh to shameful deeds, whether open or secret; take not life, which Allah hath made sacred, except by way of justice and law: thus doth He command you, that ye may learn wisdom. (6:151)
There is no special prohibition in night of qadr. If you're expecting a fear from a spider, no problem in killing it