My idea on how this spell could work would be:
Cast spell, go invisible and spawn a medium/low HP "clone" which runs to the target and begins to attack, doing flinch damage.
After 5(?) seconds, the clone disappears - no explosion.
However, if the assassin comes within one space of the clone, it will explode, causing AoE damage (medium amount...)
I imagine if it was this way;
It could be used as a distraction for mobs in PvE.
It could be used as a flinch in PvP, until the assassin reaches you, popping the explosion which acts as an initiator spell. Victims would need to either RUN, slow the assassin down, or kill the clone.
Initiator / distraction.
I thought of this idea 10 minutes ago while reading through all of your posts.
I don't fully understand the current state of the spell, and I don't play assassin.
It might be OTT, it might generally suck!
Lemme know what you think.