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If you have ground AOE on the ground, like Wall of Elements or Rain of Arrows, and you are also Light/Heavy attacking between you skill usages, you will still probably crit at least once within 20 seconds even if it's just against a single enemy. So with the passives you'd have a 12% chance to start with as long as you have an assassination ability slotted, and assuming you had no other critical bonuses, and when you do crit, physical critical goes up slightly.
|| AD - Rah'Jiin Lv50 Khajiit Nightblade (Damage) || EP - Generic Argonian Lv50 Argonian Nightblade (Tank) || DC - Zinkotsu Lv50 Breton Nightblade (Healer) || || DC - Ja'Kiro Feral-Heart Lv50 Khajiit Dragonknight (Damage) || EP - VaxtinTheWolf Lv50 Redguard Templar (Tank) || AD - Velik Iranis Lv50 Dark Elf Sorcerer (Tank ) || || EP - Einvarg The Frozen Lv50 Nord Warden (Tank/Healer) || EP - Keem-Ja Lv4 Argonian Necromancer (Healer/Tank) ||
Assuming 15 ticks of wall of elements (1 cast) chances of not proccing it at all are 0.9^15=20.5%
And that's ignoring other damage sources, and occasional crit modifiers. It is not as rare as you think.