TLDR; **Heroic CS does \~50% more damage in the same time as Relic CS.** As well as having more cleave, more knockback since more attacks per time, and being able to get more attacks off if you have to cancel the combo early.  
  
The videos just show which attacks you can get off when and indicate which attacks will land within which buff windows (AS, 50% parry). Ignore the damage numbers as I had to use a different build without battle focus to more clearly see which attacks land in the 50% parry debuff window. [Link to the build used](https://sm2meleecalc.us/?b=1IUQgJbBXdQBDGgAAAAAAEGQAAAAAAAAAAAAAAAAAAA~3AS) \- same perk setup for both. The first attack for both combos is Light 2 as I am using the full throttle skip to optimise the combos. Not necessarily required, especially for the heroic, but ideal.

Heroic has x1.3/x1.5/x2.5 melee multipliers, compared to normal x1.3/x1.9

# 2 Stacks Relic combo:

|\#|Attack|Modifiers|Minoris / Extremis|Majoris|Terminus|
|:-|:-|:-|:-|:-|:-|
|1|Light 2|Parry, Block x1.9, Armour Remaining, Auspex Parry|131.99|140.79|105.59|
|2|Heavy 3 (Shoulder Bash)|Parry, Block x1.9, Armour Remaining, Auspex Parry|269.26|287.21|215.41|
|3|Light 1|Block x1.9, Armour Remaining, Auspex Parry|64.98|71.48|51.98|
|4|Heavy 2 (Front Kick)|Block x1.9, Armour Remaining, Auspex Parry|92.87|102.15|74.29|
|**Total**|||**559.10**|**601.63**|**447.28**|

# 3 Stacks Heroic combo

|\#|Attack|Modifiers|Minoris / Extremis|Majoris|Terminus|
|:-|:-|:-|:-|:-|:-|
|1|Light 2|Parry, Block x2.5, Armour Remaining, Auspex Parry|135.50|144.53|108.40|
|2|Heavy 3 (Shoulder Bash)|Parry, Block x2.5, Armour Remaining, Auspex Parry|277.94|296.47|222.35|
|3|Light 1|Parry, Block x2.5, Armour Remaining, Auspex Parry|104.23|111.18|83.38|
|4|Light 2|Block x2.5, Armour Remaining, Auspex Parry|85.70|94.27|68.56|
|5|Heavy 3 (Shoulder Bash)|Block x2.5, Armour Remaining, Auspex Parry|176.03|193.63|140.82|
|6|Light 1|Block x2.5, Armour Remaining, Auspex Parry|65.92|72.51|52.74|
|**Total**|||**845.32**|**912.59**|**676.25**|

NB: I did not test for a comparison of 2 stacks between both. You're going to want to get 3 stacks, the x1.5 for 2 stacks alongside less base DPS for the heroics you're obviously going to be doing quite a lot less. You can use the calculator to see exactly how much but generally you won't want to use your AS at 2 stacks unless you really need armour or to get a stun.

Comparison of Relic Block Chain Sword and Heroic Block Chainsword