Step 1
Delcatty used Toxic! (-7 EN)
Miss (10, d10): 6 (No)
Snaelstrom was badly poisoned! (Poison, Toxin)
Snaelstrom's endurance fell! (-20 EP)
Snaelstrom used Surf!
Crit (1, d24): 10 (No)
(9 + 3 + (3 - 2) - 1)*1 + 2 = 14
Delcatty's Stamina!
Delcatty's Defense rose! (+2 Def, next 2 turns)

Snaelstrom munched on the Leftovers! (+6 EP)

Snaelstrom was hurt by the poison! (-1 EP)
Step 2
Delcatty used Thunderbolt! (-7 EN)
Crit (1, d24): 8 (No), Paralysis (No)
(9 + (2 - 3) + 1)*1.5 => 14
Snaelstrom used Surf!
Crit (1, d24): 18 (No)
(9 + 3 + (3 - 2) - 1)*1 + 4 = 16
Delcatty's Stamina!
Delcatty's Defense rose! (+3 Def, next 2 turns)

Snaelstrom munched on the Leftovers! (+2 EP)

Snaelstrom was hurt by the poison! (-2 EP)
Round Summary

HP: -14-16 = -30

EN: -7-7 = -14

EP: -20+6-1-14+2-2 = -29