"On Kill" Sigils
Fully killed player (not just downed), yes, yes and no, stacks are only lost when downed.
That was 4 questions, not two.
Thank you for answering my four questions
If you get xp for it, you get the “on kill” effect.
Fishsticks
I’d personally look into on kill and on interrupt sigils they work wonders for engis.
Balance Team: Please Fix Mine Toolbelt Positioning!