I keep read the tome read message to summon sandstone goblin, it just keep going but i can read the message button prepare opend the portal but i open collecting paper. Freeze It keep collecting untill today i seen that i used it but zero out 5 and i cant try to collection the paper in library. Now it just zero and i summon 5 tome met at the boss like hydra or sandstone i need summon fight the boss. I cant use to summon the time message to summon portals keeping collecting them paper apprentices stuck. Now i cant keep up collection or activated seem to stuck in the library. I like summon any bosses now i keep read fule until it got stuck. I see now after complete 5/5 go back zero to 5. Then i see after that it just gets worst now o/5 but with 5 tome. I cant activate. Zzzzz 
Device Type: samsung
Device Model: a16
Device Operating System: android
Diablo Immortal App Version: 3.3.3
There is only a small chance of summoning either. Plus once either has been summoned they have personal 30 min cooldowns before they can be summoned again.
Not getting the hydra or golem when using the tomes is not a bug and, even if you summon and kill them, you still may not get the item needed for Iben Fahd’s sanctum…
The problem is keep collecting what I cant see the awesome right click i cant summon none of neither hydra or sandstone. I only had reached find collect 5 tome limited still cant see the cooldown. SO i thought mayde its like friday or thrusday thing.
That result IS VERY RANDOM, like Iben Fahds cause i see my item save key 300s n 600 level and key i save only twice finish the box. I still opening all chest but it didnt get that stone. my luck i think run out…
If my book cant open portal stuck in that temple cant return. Technically thinking im in
Lost pages.
Bad luck with a random chance is not a bug though.
This is also not a bug.
If you need Ibens open chest as you get the keys don’t wait for full run. The % is per chest, took my one friend over 6 months.
Pages in the library keep an eye on world chat usually ppl announce when either are spawned each kill is a % chance to get the item.