One each pull has bonus HOTM chance, no different between 1xpull or 10xpull or 30xpull (the different is only gems is cheaper over 1xpull).
And each HOTM bonus also has a chance to get another HOTM (but very very rare).
Here is sample:
One each pull has bonus HOTM chance, no different between 1xpull or 10xpull or 30xpull (the different is only gems is cheaper over 1xpull).
And each HOTM bonus also has a chance to get another HOTM (but very very rare).
Here is sample: