Edited for FG: https://www.grimtools.com/calc/4VxgKOl2
Ignore GT link below, I’ve just left it there because it’s a depiction of what I actually used in the YT video. The build above has been tested by me several times over the past few days, and the nerf to RoH is 100% mitigated by taking RoK. Double rune makes too much sense to pass up on.
GT link: https://www.grimtools.com/calc/q2m9oQo2
GT link with greens: https://www.grimtools.com/calc/eVLzbALN
Youtube video: https://www.youtube.com/watch?v=BLgxp_dEjgk&feature=youtu.be
Green setup used in video. Improvement in cleartime was negligible. Possibly even worse.
Firstly, and as always, my gratitude to all the legends out there who put up with me. Notable shoutout to seriouscomedy.
Preface
As a HUGE fan of CDR, I feel that the octavius set isn’t being used to it’s full potential. With BiS rolls, the set itself gives a whopping 18% CDR, with an average value of 15% (essentially a free 22/12 starpact).
Stacking raw IT damage on forcewave IS extremely viable, however, it defeats what I believe to be the unique ‘X-factor’ of the set.
Thus, I set about building an IT tactician around RoH using beronath reforged.
One beautiful thing about IT RoH is that we are free to use bladetwister signet! While we do convert approximately 16% - 23% of our elemental damage to pierce instead of physical damage, all elemental DoT damage will still remain as IT damage.
Since that’s where the majority of our damage comes from, the additional -10% phys res goes a long way. (We have a grand total of -82% phys RR, and -42% pierce RR).
Chillspikes was also opted for due to its amazing frostburn damage. In addition, it gives us a free spammable skill with a sheet DPS of 100k. 
Offence/Defence
Cast warcry, overguard and seal --> Cycle through FW, blitz, RoH, chillspikes --> Tank and spank.
That’s literally it.
I mean we have:
- 100% block recovery
- close to 800 damage absorption (with a near 100% uptime)
- 3.3k DA
- 3k armor with 100% armor absorption
- 13.6k hp
- 34% phys resist
And this is without temporary buffs up. Note: I consider overguard and obelisk to be ‘permanent buffs’ given that their downtimes are 0.5s, and 1.6s respectively.
I honestly think you would have to intentionally try to kill yourself for you to die.
I’ve facetanked 2x reaper, valdaran, and the mountain at 160 without moving from my seal. The largest damage spike throughout that entire fight was about 15% of my health bar. Check out the youtube video and weep before its glory.
Devotions
- Yellow crossroad
- Assassin’s blade - Bind to Chillspikes
- Targo’s anvil
- Panther, eel, wraith, shield maiden; Spec out of yellow crossroad
- Wolverine
- Harp, crab
- Obelisk (ignore retaliation node)
- Oleron (ignore flat physical damage node) - Bind to Seal
All other celestial powers ought to be bound to permanent buffs like oleron’s rage.
Choice of relic
Mogdrogen’s ardor was chosen over doom to get that 15/12 chillsurge. I feel that the additional projectile was more worthwhile than doom.
Levelling
Level with FW
Should you find energy management to be a PITA…
I suggest trying the proposed solutions one at a time (in this order), and combining them IF AND ONLY IF energy is still too difficult to manage.
- Swap out bottom right node in Obelisk for the first node in scythe
- Trade: i. said node from obelisk, ii. IT node from oleron’s, iii. Wraith --> Complete scythe
- Use solar radiance for weapon augments.
As always - I’m open to feedback. 
