The suggestion is based on the introduction of mana (focus) casters on the server and adding some level of sustaining - at a cost.
It will contain two variant suggestions to be considered for balance reasons. Both will be based on Herbalism for cooking/brewing.
Function:
A Potion of Focus, would be a potion that restores a % of Focus for Invoker Casters.
Bonus - Non-Invokers (and invokers overflowing from max Focus? could get some quirky prompt from the overflow of arcane energies. Could be something as basic as seeing things, visual effect or similar.
Balance Considerations:
Variant 1: No Limitations - Lower Focus Restoration %, Time Gated crafting, add higher cost on crafting points + materials. Consecutive Chugging having Diminishing Effects with diminishing effect decay every server tick?
Variant 2: Mirrored Potion of Heal. Sobriety Cost for Higher Focus Restoration %. Lower cost to craft, no diminishing effects.
This adds a recourse method in 'oh no I'm oom' scenarios and also long-term trips while adding appropriate costs to not make it oppressive. It's simply an alternative to Hot Chocolate Spam -> Rest