[Warning!, Tip, Danger!] The Old Moderator and the Sea (apologies to Ernest Hemingway and @Kerridoc ) or Wilbur and harpoons in Trials of Piety
Harpoons only do 750 damage to target.
But Wonderful feast includes a damage sharing buff for the enemies.
So use you harpoons BEFORE triggering Wonderful feast.
If you make a mistake, save your remaining harpoons until after enemy damage sharing expires.
Click for 5* battle items rant
Except for Harpoons, 5* battle items require titan parts.
Titan parts only drop every 23 hours since that is the time to spawn each titan.
Except for harpoons, 5* battle items should effect all enemies and all allies.
Single enemy, and single ally, 5* battle items are just meh meh meh.
"Grant me the Serenity to accept the things I cannot bribe the GM about,
Courage to change the things I can bribe the GM about,
And the successful wisdom roll to know the difference "
-Table top RPG Serenity prayer
How do I bribe SGG to buff 5* battle items?
With two very strong healers, I used
0x Heath potions
Luckily I did not need my health potions as good board RNG let me get my healers fully charged early in the first mob wave.
5x Mana 25% potions
Once the trial’s healing boss was at 50% mana bar, I used 1x Harpoon and realized the triple bosses had a damage sharing buff !!!
I waited for their damage sharing buff to expire, and used 4x harpoons on Healer boss, then killed the healer boss with tiles.
Without a healing boss, the other bosses slowly ground to zero HP.
Without a healing boss, counterattack could not do enough damage to overwhelm my two very strong healers.
The boss wave of Trial of Piety took 9 minutes and 30 seconds with my messing around with a new strategy and the following rainbow team
Valeria 4*+1 ( I want more )
Wilbur 4*+1 ( use AFTER harpoons)
Vivica 5* 4.80 ( need more 5* healers)
Hansel 4*+1 ( cleric and monk bosses resisted witch killer special skill many times )