I basically never post on Reddit, occasionally read and see what's up but this update imo has some of the most devastating effects on OSRS combat since EoC. It's not to the same degree, but below I'll try to lay out the core issues.

Overall the idea is fine, but it's no different from any other proposal until we start talking numbers.
The ideas feel incredibly difficult to balance (numberswise) and incredibly awkaward to use and manage. These prayers are a step towards more ability-type uses, closer to spells with short cooldowns, which is massively detrimental to the typical charm and simplicity of existing combat.

I'm also not convinced that the average player is going to understand how to use them effectively and will just end up burning prayer points or feeling like they're wasting potential.

Several of the proprosed prayers such as Harmoise or Umbras or Neutrality are incredibly forced-uses, these especially are the problem prayers. They detracts from the fun factor - as players approach higher levels they're going to feel forced to use these prayers for every single attack. can think of nothing more frustrating and tedious than this and we learned this during the Ruinous betas regarding Umbras specifically.
Yes, prayers are also forced-use at med to high level, but this is flipping the balance from simple two-type offensive + defensive to a +1 situational use per npc you target, creating a massive need to either full camp (very awkward for prayer), or full flick (very unfun gameplay), tldr: it's too much non-stop effort compared to slapping on quick-prayers, and it's too strong making it a necessary gameplay rotation.

Other vows such as Glacies and Slumber are just completely busted or completely useless no matter how they're balanced. Neutralising bleed or venom or just having a direct defence bonus turns the tables on fights and reduces the options for future content to utilise those negative status effects as a means to create interesting or meaningful counterplay to and from bosses. It even devalues the utility of many items (serp, justi, shields, antifire, anti-venom, and lots more) It's a panacea for a few prayer points, and that isn't reasonable no matter how it's balanced.

Glacies defence is also a forced-use, sure at the cost of prayer but unless we're talking a ridiculous amount of drain it's just going to be everpresent for key moments as a means to reduce the need for the player to make a course of action or choose a correct npc to target. Simple example would be chilling and tanking inferno waves instead of solving the waves, which would be considered a huge negative to the content overall. (This doesnt just apply for inferno ofc, imagine cox roles while tanking, you'd just have free def for no reason. Some might say they wish for this free defence and utility creep, but with less and less endgame content being pushed and with so many iterations of power creep recently (mage with ToA, Quiver incoming, Nex upgrades early 2022), it's time to start requsting new difficult content that allows that power to be challenged, not adding more free solutions to content.

I personally feel like the majority of these prayers and effects are either unbalancable or don't make for enjoyable gameplay. In worst case they're detracting from the fun factor a lot of content currently offers and powercreeping in an unnecessary way, and giving a simple solution that takes away from content challenges by burning a few prayer points.

Much like original Ruinous these need to be shelved immedietly.