Quite situational and hard to use. As for Alexander there are a few times where I like to use it. For example A1 - boss readies to jump up, cast Adlo on tank/WAR and throw E4E while running to the safespot placing sacred soil. Then deploy the buffs and giggle (especially if it crit).

A2 - this is a fun one, sometimes a dps or the fairy stands quite conveniently to spread the buffs to both tanks. Spreading E4E here is super nice

A3 - right before his cascade (cause that thing hurts a lot) also good for spreading E4E during his double slap phase...

Or another example, A4 - after the legs are killed, people usually rush under the boss , cast both buffs on tank/WAR or whoever is placed the best and deploy away.

It's a fun spell to use really.