So, a ruling came up about the damage of this spell in our last session. Gm and three different players each had a different thought on the damage.
1) you only get one attack, it deals 1d4 + (shards-1)
2) you get a number of attacks equal to sh ards, each one doing 1d4 + 1
3) you get a number of attacks equal to shards, each one doing 1d4 + (shards -1)
4) you get a number of attacks equal to shards, each one doing 1d4 + number of shards that hit previously (think hammer the gap)
Not sure if anyone would check back on this, but I had read it as option #3. We had a discussion at a table last night and the GM ruled #1 until we got a better (official) ruling. Now that someone has pointed it out, I think it can be read both ways
The wording of the spell is poor at best. Here is the sentence that causes the issue: "The shards deal an amount of slashing and piercing damage equal to 1d4 points + 1 point per shard beyond the first, and have a threat range of 19–20."
While it does allow a character to be able to deal damage over time, it cost a move action, so it can really mess with higher level action economy.
The spell also requires you to be adjacent to the target, so not exactly overpowered.