I've been trying to figure out ways to improve the Wish saving throw. Rolling 2d10 percentile dice then using Heroic Inspiration to re-roll one of them improves the odds slightly, if my math is correct.

>roll 00 and 0, 30 and 4-9, or 40+
+77 automatic successes
>roll 00 and 1-9
+54 successes re-rolling 40-90
+6 successes re-rolling 30 and having 4-9 already
-27 failures re-rolling 00 through 20
-3 failures re-rolling 30 and having 1-3 already
>roll 10 or 20
+120 successes re-rolling 40-90
+2 successes re-rolling 00 and having 0 already
+12 successes re-rolling 30 and having 4-9 already
-40 failures re-rolling 10-20
-18 failures re-rolling 00 and having 1-9 already
-8 failures re-rolling 30 and having 0-3 already
>30 and 0-3
+24 successes re-rolling 40-90
+1 success re-rolling 00 and having a 0 already
-12 failures re-rolling 10-30
-3 failures re-rolling 00 and having 1-3 already

>combinations: 407
>fails: 111
>27% failure rate

>>95996745 (OP)
If your players have access to wish, the campaign should basically be over already.

Hell, trying to play D&D 5e past level 10 is an exercise in masochism.

>>95996745 (OP)
Why do they specify necrotic damage if it's utterly irresistable?