tl;dr:
Sage's Eukrasian Prognosis/Diagnosis can overwrite Scholar's buffed Galvanize shield, even if it would provide a 99% lower shield
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I opened 2 bug reports, one was moved to insufficient information (ok, makes sense, my bad
https://forum.square-enix.com/ffxiv/...olars-Barriers)
and the second one was moved to
"working as intended"
https://forum.square-enix.com/ffxiv/...vanize-shields
The steps to reproduce this are really simple and everyone can
ruin his co-healers life try it out:
1. Scholar uses "Recitation" + "Adloquium" + "Deployment Tactics", granting the whole Group a boosted effect of "Galvanize"
2. Sage uses Eukrasian Prognosis
3. Group gets hit by a raid wide AoE from the Sage (lul), aka magicked barrier overwrites boosted Galvanize effect of the Scholar, resulting in a much smaller barrier.
The problem is that only stronger Scholar Shields can overwrite Sage Shields, while Sage can overwrite Scholar Shields with (much) weaker ones, which results in wasted cooldowns, indirect damage (or if timed poorly direct damage) to the whole party.
e.g.:
- 1 to 8 player(s) in your group eat some dmg and fall to 5k HP. the boss begins to cast a raid wide AoE dealing 10k HP.
(Players at 5k HP)
- Scholar begins casting his usual "Recitation" + "Adloquium" + "Deployment Tactics" combo with maybe some additional heal boosting buffs, spreading a 7k HP shield to the whole group, enough to survive the incoming raid wide AoE
(Players at 12k HP)
- The Sage casts Eukrasian Prognosis, mostly unbuffed, overwriting the Galvanize Shield with a 2k HP shield. Effectively dealing a 5k raid wide AoE to his group.
(Players at 7k HP)
Boss finishes his raid wide AoE cast and deals 10k HP. everyone dies
(Players at -3k HP, aka ded)
I know this example is extreme and would rarely occur in real situations, and that in a single target case the scholar would cast buffed Adloquium on the player who made the mistake, which would then also heal him and give him another shield which cannot be overwritten (at least not from the E.Prognosis) and that E.P also heals a bit, but the example shows how a Sage can in 100% of situations where he is paired with a scholar and the scholar uses his go-to 90s CD AoE shield, deal a raid wide AoE to his own group. and this is working as intended.
Real Gameplay Example in the first comment as it's too long to include here apparently.