Providence and Precautions
Avernus has been hardening its defences to Chaos ever since it first emerged as a possibility millions of years ago. Careful experimentation, trial and error, more dangerous tests and other esoteric means were used to grow its stock of knowledge and it has been implementing this knowledge ever since.
However, delegation is an artform, the World has far more pressing concerns than personally implementing these alterations. It has creatures for that.
Providence, the Overseer of Nature, was charged with ensuring that these improvements were added, to ensure that if Chaos so much as stepped foot upon the World, it would be instantly slowed, harmed and subjected to cruelties even it would find unbearable.
Thus, was its charge and Providence set about it with a stoic grind. It could reshape the land instantly and be done with it, but that was not it's way. Its way was slower, but more permanent. The land started to shift, the fundamental nature of the World changed. Mountains disappeared and changed before their appointed time, rivers sprang forth into existence where there had been done before, valleys dug themselves faster than was possible in the material world.
None of this would have been possible without the oversight of Providence, the only being save the world itself, with the expertise and power to reshape Nature on this scale without harming the precious experiments around it.
Now at long last it's great work was complete, and just in time. 0.3 cycles ago Chaos had come, and its work had been so close to completion. Close, but not finished.
Pride filled its form as the wards it had spent so long laboriously and painstakingly crafted burst into life, pillars of silvered light bursting forth from the ground, the aura sending the blood-soaked hoard into screams of pain, their progress momentarily halted entirely and permanently slowed, their movements more sluggish and weakened.
It would not stop them of course, these blood-soaked were most resistant to attacks like this, but it would slow them down, weaken them and that was more than was needed.
A final check ensured that all was operating at maximum efficiency, before it turned its attention to its other weapons.
It was the weakest of the Great Ones in terms of raw power, and while even the weakest Apex was still more powerful than anything less than a God, its power set was not optimised for this kind of fighting. Others would take the field and it would support them, in its own way.
Traps millions of years in the making stood ready to be triggered upon its command, as it surveyed the World, locating important assets, flagging them for assistance.
Its first target was a phalanx of Bloodthirsters, minor examples of the Greater Demon, but Bloodthirsters none the less, leading a hoard of millions of lesser daemons towards a People who had been recently weakened by internal strife. If this force was allowed to impact them before they were ready the chances of their destruction were high…unacceptably high.
Though mighty and powerful the filthy creatures lasted but a few seconds when a buried fault line finally burst, the eruption shaking the ground for miles around sending forth a tidal wave of compressed air and toxic gases as magma infused with psycic power as was all things of the world, burned their very essence.
That trap spent it returned its full attention to the wider world, watching. Waiting for the right time to unleash that fury again.
To do otherwise would be imprudent.
@Durin
Great One Omake, hope this helps and or works.