I know its 20 per 5k at least or around there - other then that - dragon damage += ranking - but not exact details

Well it seems to vary on toon level also, and seem to vary from 180-320 per Insigna if you include dragon and skellie damage.

I just found somthing interesting from Lance, the damage done to minions seems to not count towards your insigna count, this would explain the large inconsistency with my data.

I will make some new data, and only join late so less chance of any minion damage. or will keep a note in minion damage.

As far as i know i was under the impression that there were 1K insignia total distributed among all players, proportional to their damage on boss.

DBM_Bones,

You do such and such a % of overall damage in the fight you get that % of the 1k of insignia available I think.

I think you may be right, about the 1k total, just need to do one more boss fight to confirm this, and have an exact figure.
Does seem that damage to there minions does not count

Fairly certain it is only damage to boss that counts towards insignias but it may be adjusted according to your level.

maybe it goes along the line of % of damage done to boss = that % out of 1k insignias

Yes it is 1000 Insigna / buy player damage.
Top boss has 221387 HP. so 221 Damage per insigna, It does seem only boss count.
I will do 2 exact tests with only 1 skellie and 1 Dragon.

I done more test making notes of damage of summons an they all count, and give you Insigna, but only if they damage boss.