(Reading the arena description, it's mostly... dirt, with some water. Haha, Petals gets Earthquake. How lucky!)
(And indeed, it needs a multi-hit combo for auto crit.)

Petals (F)
HP: 78
EN: 77
Stat: N/A
Other: N/A
Ability: Overgrow
Odin (M)
HP: 75
EN: 85
Stat: N/A
Other: Leech Seed (3a), Focus Energy (5a)
Ability: Poison Point (Deactivated)
Arena: N/A
Round 7 - Whack!
Okay so I have to omit flavor for this round - blame the people who stopped reffing. A_A
Calculations
Action 1
Petals (Nature Power Earthquake): (10-1.5) x 1.5 = 12.75 ~ [13 DMG/9 EN]
(886/1000 = no crit)
Odin (Sludge Bomb): (9+3-1.5) x 1.5 = 15.75 ~ [16 DMG/6 EN]
(783/1000 = no crit) (3/1000 = poison)
Petals became badly poisoned! (Due to Poison Point's deactivation effect.)
Post-action:
+3 HP (Petals)
-3 HP (Odin)
-1 HP (Petals)
Action 2
Petals (AncientPower): (6+0) = [6 DMG/4 EN]
(615/1000 = no crit) (499/1000 = no effect)
Odin (Ice Beam): (10-1.5) x 1.5 = 12.75 ~ [13 DMG/7 EN]
(967/1000 = no crit) (367/1000 = no freeze)
Post-action:
+3 HP (Petals)
-3 HP (Odin)
-1 HP (Petals)
Action 3
Petals (Protect)
Odin (Chill): [Failed]
Petals (Protect): [7 EN]
Post-action:
+3 HP (Petals)
-3 HP (Odin)
-1 HP (Petals)
Leech Seed ended.

Petals (F)
HP: 55
EN: 57
Stat: N/A
Other: Toxic (2)
Ability: Overgrow
Odin (M)
HP: 53
EN: 72
Stat: N/A
Other: Focus Energy (2a)
Ability: Poison Point (Deactivated)
Arena: N/A
TalkingLion issues actions.
EndQuote issues actions.
I ref.