Greetings. The Skill 1 for Ithos is:

Gouge Level 1

Attacks 1 enemy. Has a 20% chance of granting an Extra Turn.

Decreases enemy MAX HP by 15% of damage dealt.

Damage based on: [ATK]

Lvl. 2 Damage +5%

Lvl. 3 Damage +5%

Lvl. 4 Damage +10%

Lvl. 5 Damage +10%

The Decrease Max HP is causing issues on Clan Boss. On the battle results screen it will show me a higher number than what it records on the leaderboard. This happens only when Ithos is on my Clan Boss team. Recently I attacked the Normal Clan Boss and was unable to kill the Clan Boss. The Clan Boss had 6.4mil health left and I normally do 10-12mil on Normal. The battle showed me killing the Clan Boss and doing 6.4mil damage. It would not let me replay the fight. Upon pressing the Skip button in the top right I found out that it only recorded me doing 6.1mil against the Clan Boss. The Clan Boss had just under 200k health left.