Helm of Isen's Peak

Action -

, destroy this: Your hero gets +1

until end of turn.

Battleworn

Rulings

From the Welcome to Rathe release notes

The blue symbol is intellect. This is your hand size (How much you draw up to at the end of turn.)
You draw up to your hand size before end of turn effects wear off.
Helm of Isen’s Peak requires an action point to activate. It does not have go again. Activating Helm of Isen Peak will usually end your action phase.
When you defend with a card it remains on the combat chain until the chain closes, therefore you cannot defend with an equipment multiple times on the same chain link.

Keyword notes

Battleworn - Equipment that wear down after each time they are used to defend. If you defend with a card with Battleworn, put a -1{d} counter on it when the combat chain closes.

When you defend with a card it remains on the combat chain until the chain closes, therefore you cannot defend with an equipment multiple times on the same combat chain.
A -1 counter stays on the card until the card is destroyed or the game ends.
If the defense of a card that is defending is below zero, its defense value is considered to be zero.
When this card is destroyed, it is sent to your graveyard. (Not when it has 0)
When this card is destroyed, it is sent to your graveyard.
If the defense of a card that is defending is below zero, calculate as if its defense is zero.